diff --git a/actions/letsencrypt b/actions/letsencrypt
index 7dd4a6116..afa74a0cd 100755
--- a/actions/letsencrypt
+++ b/actions/letsencrypt
@@ -60,7 +60,7 @@ APACHE_CONFIGURATION = '''
 	CustomLog ${{APACHE_LOG_DIR}}/ssl_access.log combined
 	#   GnuTLS Switch: Enable/Disable SSL/TLS for this virtual host.
 	GnuTLSEnable On
-	#   Automatically obtained certficates from Let's Encrypt
+	#   Automatically obtained certificates from Let's Encrypt
 	GnuTLSCertificateFile	/etc/letsencrypt/live/{domain}/fullchain.pem
 	GnuTLSKeyFile /etc/letsencrypt/live/{domain}/privkey.pem
 	#   See http://www.outoforder.cc/projects/apache/mod_gnutls/docs/#GnuTLSPriorities
@@ -82,14 +82,14 @@ def parse_arguments():
     revoke_parser.add_argument(
         '--domain', help='Domain name to revoke certificate for')
     obtain_parser = subparsers.add_parser(
-        'obtain', help='Obtain certficate for a domain and setup website.')
+        'obtain', help='Obtain certificate for a domain and setup website.')
     obtain_parser.add_argument(
         '--domain', help='Domain name to obtain certificate for')
 
     return parser.parse_args()
 
 
-def get_certficate_expiry(domain):
+def get_certificate_expiry(domain):
     """Return the expiry date of a certificate."""
     certificate_file = os.path.join(LIVE_DIRECTORY, domain, 'cert.pem')
     output = subprocess.check_output(['openssl', 'x509', '-enddate', '-noout',
@@ -111,7 +111,7 @@ def subcommand_get_status(_):
     for domain in domains:
         domain_status[domain] = {
             'certificate_available': True,
-            'expiry_date': get_certficate_expiry(domain),
+            'expiry_date': get_certificate_expiry(domain),
             'web_enabled':
             action_utils.webserver_is_enabled(domain, kind='site')
         }
diff --git a/plinth/modules/letsencrypt/__init__.py b/plinth/modules/letsencrypt/__init__.py
index a9a86b45f..c6248e191 100644
--- a/plinth/modules/letsencrypt/__init__.py
+++ b/plinth/modules/letsencrypt/__init__.py
@@ -39,12 +39,12 @@ title = _('Certificates (Let\'s Encrypt)')
 
 description = [
     format_lazy(
-        _('A digital certficate allows users of a web service to verify the '
+        _('A digital certificate allows users of a web service to verify the '
           'identity of the service and to securely communicate with it. '
           '{box_name} can automatically obtain and setup digital '
           'certificates for each available domain.  It does so by proving '
           'itself to be the owner of a domain to Let\'s Encrypt, a '
-          'certficate authority (CA).'), box_name=_(cfg.box_name)),
+          'certificate authority (CA).'), box_name=_(cfg.box_name)),
 
     _('Let\'s Encrypt is a free, automated, and open certificate '
       'authority, run for the public\'s benefit by the Internet Security '
diff --git a/plinth/modules/letsencrypt/templates/letsencrypt.html b/plinth/modules/letsencrypt/templates/letsencrypt.html
index 9460a81c0..9d6264d2a 100644
--- a/plinth/modules/letsencrypt/templates/letsencrypt.html
+++ b/plinth/modules/letsencrypt/templates/letsencrypt.html
@@ -59,7 +59,7 @@
                   </span>
                 {% else %}
                   <span class="label label-warning">
-                    {% trans "No certficate" %}
+                    {% trans "No certificate" %}
                   </span>
                 {% endif %}
               </td>
diff --git a/plinth/modules/letsencrypt/views.py b/plinth/modules/letsencrypt/views.py
index f9551be45..2b51f04a3 100644
--- a/plinth/modules/letsencrypt/views.py
+++ b/plinth/modules/letsencrypt/views.py
@@ -48,7 +48,7 @@ def index(request):
 
 @require_POST
 def revoke(request, domain):
-    """Revoke a certficate for a given domain."""
+    """Revoke a certificate for a given domain."""
     try:
         actions.superuser_run('letsencrypt', ['revoke', '--domain', domain])
         messages.success(
@@ -65,7 +65,7 @@ def revoke(request, domain):
 
 @require_POST
 def obtain(request, domain):
-    """Obtain and install a certficate for a given domain."""
+    """Obtain and install a certificate for a given domain."""
     try:
         actions.superuser_run('letsencrypt', ['obtain', '--domain', domain])
         messages.success(