diff --git a/README.md b/README.md
index 00cba05..b526158 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@ python manage.py db init
 python manage.py db migrate
 python manage.py db upgrade
 
-## Developemt !!!
+## Development only
+
 python manage.py db history
 python manage.py db downgrade
 // reset git: migrations/versions
@@ -12,18 +13,22 @@ python manage.py db migrate
 python manage.py db upgrade
 
 ## Kill local detached server
+
 lsof -i :5000
 kill -9 PIDNUMBER
 
-# i18n
+## i18n
 
-https://pythonhosted.org/Flask-BabelEx/
+<https://pythonhosted.org/Flask-BabelEx/>
 
 ## Init
+
 pybabel extract -F babel.cfg -o messages.pot . && pybabel extract -F babel.cfg -k lazy_gettext -o messages.pot . && pybabel init -i messages.pot -d translations -l de
 
 ## Neue msgid's scannen und in *.po mergen
+
 pybabel extract -F babel.cfg -o messages.pot . && pybabel extract -F babel.cfg -k lazy_gettext -o messages.pot . && pybabel update -i messages.pot -d translations
 
 ## Nach dem Übersetzen
+
 pybabel compile -d translations
diff --git a/app.py b/app.py
index b543c61..3fe9256 100644
--- a/app.py
+++ b/app.py
@@ -24,6 +24,8 @@ app.config['SECURITY_TRACKABLE'] = True
 app.config['SECURITY_REGISTERABLE'] = True
 app.config['SECURITY_SEND_REGISTER_EMAIL'] = False
 app.config['LANGUAGES'] = ['en', 'de']
+app.config['GOOGLE_OAUTH_CLIENT_ID'] = os.environ['GOOGLE_OAUTH_CLIENT_ID']
+app.config['GOOGLE_OAUTH_CLIENT_SECRET'] = os.environ['GOOGLE_OAUTH_CLIENT_SECRET']
 
 # Generate a nice key using secrets.token_urlsafe()
 app.config['SECRET_KEY'] = os.environ.get("SECRET_KEY", 'pf9Wkove4IKEAXvy-cQkeDPhv9Cb3Ag-wyJILbq_dFw')
@@ -48,6 +50,9 @@ db = SQLAlchemy(app)
 from models import EventCategory, Image, EventSuggestion, EventSuggestionDate, OrgOrAdminUnit, Actor, Place, Location, User, Role, AdminUnit, AdminUnitMember, AdminUnitMemberRole, OrgMember, OrgMemberRole, Organization, AdminUnitOrg, AdminUnitOrgRole, Event, EventDate
 user_datastore = SQLAlchemySessionUserDatastore(db.session, User, Role)
 security = Security(app, user_datastore)
+from oauth import blueprint
+
+app.register_blueprint(blueprint, url_prefix="/login")
 
 berlin_tz = pytz.timezone('Europe/Berlin')
 now = datetime.now(tz=berlin_tz)
diff --git a/migrations/script.py.mako b/migrations/script.py.mako
index 2c01563..ee5cea7 100644
--- a/migrations/script.py.mako
+++ b/migrations/script.py.mako
@@ -7,6 +7,7 @@ Create Date: ${create_date}
 """
 from alembic import op
 import sqlalchemy as sa
+import sqlalchemy_utils
 ${imports if imports else ""}
 
 # revision identifiers, used by Alembic.
diff --git a/migrations/versions/abf0f671ba27_.py b/migrations/versions/abf0f671ba27_.py
new file mode 100644
index 0000000..c2dd613
--- /dev/null
+++ b/migrations/versions/abf0f671ba27_.py
@@ -0,0 +1,39 @@
+"""empty message
+
+Revision ID: abf0f671ba27
+Revises: bbad7e33a780
+Create Date: 2020-06-30 21:09:35.692876
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlalchemy_utils
+
+
+# revision identifiers, used by Alembic.
+revision = 'abf0f671ba27'
+down_revision = 'bbad7e33a780'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('flask_dance_oauth',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('provider', sa.String(length=50), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.Column('token', sqlalchemy_utils.types.json.JSONType(), nullable=False),
+    sa.Column('provider_user_id', sa.String(length=256), nullable=False),
+    sa.Column('user_id', sa.Integer(), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('provider_user_id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('flask_dance_oauth')
+    # ### end Alembic commands ###
diff --git a/models.py b/models.py
index a13bad9..fdc593b 100644
--- a/models.py
+++ b/models.py
@@ -4,6 +4,7 @@ from sqlalchemy.orm import relationship, backref
 from sqlalchemy.schema import CheckConstraint
 from sqlalchemy import UniqueConstraint, Boolean, DateTime, Column, Integer, String, ForeignKey, Unicode, UnicodeText, Numeric, LargeBinary
 from flask_security import UserMixin, RoleMixin
+from flask_dance.consumer.storage.sqla import OAuthConsumerMixin
 import datetime
 
 ### Base
@@ -59,6 +60,11 @@ class User(db.Model, UserMixin):
     roles = relationship('Role', secondary='roles_users',
                          backref=backref('users', lazy='dynamic'))
 
+class OAuth(OAuthConsumerMixin, db.Model):
+    provider_user_id = Column(String(256), unique=True, nullable=False)
+    user_id = Column(Integer(), ForeignKey('user.id'), nullable=False)
+    user = db.relationship('User')
+
 ### Organization
 
 class OrgMemberRolesMembers(db.Model):
diff --git a/oauth.py b/oauth.py
new file mode 100644
index 0000000..f0c0fac
--- /dev/null
+++ b/oauth.py
@@ -0,0 +1,66 @@
+from flask import flash
+from flask_security import current_user, login_user
+from flask_dance.contrib.google import make_google_blueprint
+from flask_dance.consumer import oauth_authorized, oauth_error
+from flask_dance.consumer.storage.sqla import SQLAlchemyStorage
+from sqlalchemy.orm.exc import NoResultFound
+from models import User, OAuth
+from app import db, user_datastore
+from flask_babelex import gettext
+
+blueprint = make_google_blueprint(
+    scope=["profile", "email"],
+    storage=SQLAlchemyStorage(OAuth, db.session, user=current_user),
+)
+
+
+# create/login local user on successful OAuth login
+@oauth_authorized.connect_via(blueprint)
+def google_logged_in(blueprint, token):
+    if not token:
+        flash("Failed to log in.", category="error")
+        return False
+
+    resp = blueprint.session.get("/oauth2/v1/userinfo")
+    if not resp.ok:
+        msg = "Failed to fetch user info."
+        flash(msg, category="error")
+        return False
+
+    info = resp.json()
+    user_id = info["id"]
+
+    # Find this OAuth token in the database, or create it
+    oauth = OAuth.query.filter_by(provider=blueprint.name, provider_user_id=user_id).first()
+    if oauth is None:
+        oauth = OAuth(provider=blueprint.name, provider_user_id=user_id, token=token)
+
+    if oauth.user:
+        login_user(oauth.user, authn_via=["google"])
+        user_datastore.commit()
+        flash(gettext("Successfully signed in."), 'success')
+
+    else:
+        # Create a new local user account for this user
+        user = user_datastore.create_user(email=info["email"])
+        # Associate the new local user account with the OAuth token
+        oauth.user = user
+        # Save and commit our database models
+        db.session.add_all([user, oauth])
+        db.session.commit()
+        # Log in the new local user account
+        login_user(user, authn_via=["google"])
+        user_datastore.commit()
+        flash(gettext("Successfully signed in."), 'success')
+
+    # Disable Flask-Dance's default behavior for saving the OAuth token
+    return False
+
+
+# notify on OAuth provider error
+@oauth_error.connect_via(blueprint)
+def google_error(blueprint, message, response):
+    msg = "OAuth error from {name}! message={message} response={response}".format(
+        name=blueprint.name, message=message, response=response
+    )
+    flash(msg, category="error")
diff --git a/requirements.txt b/requirements.txt
index 1c69448..f438863 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,9 @@ alembic==1.4.2
 Babel==2.8.0
 bcrypt==3.1.7
 blinker==1.4
+certifi==2020.6.20
 cffi==1.14.0
+chardet==3.0.4
 click==7.1.2
 dnspython==1.16.0
 dominate==2.5.1
@@ -10,6 +12,7 @@ email-validator==1.1.1
 Flask==1.1.2
 Flask-BabelEx==0.9.4
 Flask-Bootstrap==3.3.7.1
+Flask-Dance==3.0.0
 Flask-Login==0.5.0
 Flask-Mail==0.9.1
 Flask-Migrate==2.5.3
@@ -24,6 +27,7 @@ itsdangerous==1.1.0
 Jinja2==2.11.2
 Mako==1.1.3
 MarkupSafe==1.1.1
+oauthlib==3.1.0
 passlib==1.7.2
 psycopg2-binary==2.8.5
 pycparser==2.20
@@ -31,9 +35,14 @@ python-dateutil==2.8.1
 python-dotenv==0.13.0
 python-editor==1.0.4
 pytz==2020.1
+requests==2.24.0
+requests-oauthlib==1.3.0
 six==1.15.0
 speaklater==1.3
 SQLAlchemy==1.3.17
+SQLAlchemy-Utils==0.36.6
+urllib3==1.25.9
+URLObject==2.4.3
 visitor==0.1.3
 Werkzeug==1.0.1
 WTForms==2.3.1
diff --git a/static/site.css b/static/site.css
index 8426f7d..6547c7c 100644
--- a/static/site.css
+++ b/static/site.css
@@ -77,6 +77,11 @@ tr.table-line-through td {
     z-index: 1025 !important;
 }
 
+.btn-google {
+    color: white;
+    background-color: #ea4335;
+}
+
 @media (max-width: 320px) {
     td, th {
         word-break: break-all;
diff --git a/templates/_macros.html b/templates/_macros.html
index aac3066..1f77c31 100644
--- a/templates/_macros.html
+++ b/templates/_macros.html
@@ -192,4 +192,8 @@
       </div>
     </div>
   </div>
+{% endmacro %}
+
+{% macro render_google_sign_in_button() %}
+<a href="{{ url_for('google.login') }}" class="btn btn-google" role="button"><i class="fab fa-google mr-2"></i> {{ _('Sign in with Google') }}</a>
 {% endmacro %}
\ No newline at end of file
diff --git a/templates/layout.html b/templates/layout.html
index 5ef64a6..b7b092c 100644
--- a/templates/layout.html
+++ b/templates/layout.html
@@ -13,7 +13,7 @@
     <!-- Bootstrap CSS -->
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
     <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.1/css/all.min.css">
     <link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='site.css')}}" />
     <link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-beta.1/dist/css/select2.min.css" rel="stylesheet" />
     <!-- <link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='jquery.recurrenceinput.css')}}" /> -->
diff --git a/templates/security/login_user.html b/templates/security/login_user.html
index 06e0b56..1055c22 100644
--- a/templates/security/login_user.html
+++ b/templates/security/login_user.html
@@ -1,5 +1,5 @@
 {% extends "layout.html" %}
-{% from "_macros.html" import render_field_with_errors, render_field, render_field_errors %}
+{% from "_macros.html" import render_google_sign_in_button, render_field_with_errors, render_field, render_field_errors %}
 
 {% block content %}
 
@@ -18,4 +18,8 @@
   {{ render_field(login_user_form.submit) }}
 </form>
 
+<hr class="my-4">
+
+{{ render_google_sign_in_button() }}
+
 {% endblock %}
diff --git a/templates/security/register_user.html b/templates/security/register_user.html
index 53ece76..d4f3e93 100644
--- a/templates/security/register_user.html
+++ b/templates/security/register_user.html
@@ -1,5 +1,5 @@
 {% extends "layout.html" %}
-{% from "_macros.html" import render_field_with_errors, render_field %}
+{% from "_macros.html" import render_google_sign_in_button, render_field_with_errors, render_field %}
 
 {% block content %}
 
@@ -14,4 +14,8 @@
   {{ render_field(register_user_form.submit) }}
 </form>
 
+<hr class="my-4">
+
+{{ render_google_sign_in_button() }}
+
 {% endblock %}
diff --git a/translations/de/LC_MESSAGES/messages.mo b/translations/de/LC_MESSAGES/messages.mo
index 0769d6d..8e2f54a 100644
Binary files a/translations/de/LC_MESSAGES/messages.mo and b/translations/de/LC_MESSAGES/messages.mo differ
diff --git a/translations/de/LC_MESSAGES/messages.po b/translations/de/LC_MESSAGES/messages.po
index a2ea832..fe39704 100644
--- a/translations/de/LC_MESSAGES/messages.po
+++ b/translations/de/LC_MESSAGES/messages.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2020-06-26 12:23+0200\n"
+"POT-Creation-Date: 2020-07-01 08:43+0200\n"
 "PO-Revision-Date: 2020-06-07 18:51+0200\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language: de\n"
@@ -18,90 +18,94 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: app.py:61
+#: app.py:66
 msgid "Event_"
 msgstr ""
 
-#: app.py:66
+#: app.py:71
 msgid "Event_Art"
 msgstr "Kunst"
 
-#: app.py:67
+#: app.py:72
 msgid "Event_Book"
 msgstr "Literatur"
 
-#: app.py:68
+#: app.py:73
 msgid "Event_Movie"
 msgstr "Film"
 
-#: app.py:69
+#: app.py:74
 msgid "Event_Family"
 msgstr "Familie"
 
-#: app.py:70
+#: app.py:75
 msgid "Event_Festival"
 msgstr "Festival"
 
-#: app.py:71
+#: app.py:76
 msgid "Event_Religious"
 msgstr "Religion"
 
-#: app.py:72
+#: app.py:77
 msgid "Event_Shopping"
 msgstr "Shopping"
 
-#: app.py:73
+#: app.py:78
 msgid "Event_Comedy"
 msgstr "Comedy"
 
-#: app.py:74
+#: app.py:79
 msgid "Event_Music"
 msgstr "Musik"
 
-#: app.py:75
+#: app.py:80
 msgid "Event_Dance"
 msgstr "Tanz"
 
-#: app.py:76
+#: app.py:81
 msgid "Event_Nightlife"
 msgstr "Party"
 
-#: app.py:77
+#: app.py:82
 msgid "Event_Theater"
 msgstr "Theater"
 
-#: app.py:78
+#: app.py:83
 msgid "Event_Dining"
 msgstr "Essen"
 
-#: app.py:79
+#: app.py:84
 msgid "Event_Conference"
 msgstr "Konferenz"
 
-#: app.py:80
+#: app.py:85
 msgid "Event_Meetup"
 msgstr "Networking"
 
-#: app.py:81
+#: app.py:86
 msgid "Event_Fitness"
 msgstr "Fitness"
 
-#: app.py:82
+#: app.py:87
 msgid "Event_Sports"
 msgstr "Sport"
 
-#: app.py:83
+#: app.py:88
 msgid "Event_Other"
 msgstr "Sonstiges"
 
-#: app.py:1062
+#: app.py:1067
 msgid "Event successfully created"
 msgstr "Veranstaltung erfolgreich erstellt"
 
-#: app.py:1094
+#: app.py:1099
 msgid "Event suggestion successfully created"
 msgstr "Veranstaltungsvorschlag erfolgreich erstellt"
 
+#: oauth.py:41 oauth.py:54
+msgid "Successfully signed in."
+msgstr "Erfolgreich eingeloggt."
+
 #: templates/_macros.html:72 templates/event/create.html:6
 msgid "Create event"
 msgstr "Veranstaltung erstellen"
@@ -164,6 +168,10 @@ msgstr "Link"
 msgid "Category"
 msgstr "Kategorie"
 
+#: templates/_macros.html:198
+msgid "Sign in with Google"
+msgstr "Mit Google anmelden"
+
 #: templates/admin_unit.html:14 templates/organization.html:17
 msgid "Members"
 msgstr "Mitglieder"