diff --git a/redbot/cogs/streams/streams.py b/redbot/cogs/streams/streams.py
index 32b42de2b..3a0f5d92a 100644
--- a/redbot/cogs/streams/streams.py
+++ b/redbot/cogs/streams/streams.py
@@ -108,13 +108,13 @@ class Streams:
     @_twitch.command(name="channel")
     async def twitch_alert_channel(self, ctx: RedContext, channel_name: str):
         """Sets a Twitch stream alert notification in the channel"""
-        await self.stream_alert(ctx, TwitchStream, channel_name)
+        await self.stream_alert(ctx, TwitchStream, channel_name.lower())
 
     @_twitch.command(name="community")
     async def twitch_alert_community(self, ctx: RedContext, community: str):
         """Sets a Twitch stream alert notification in the channel
         for the specified community."""
-        await self.community_alert(ctx, TwitchCommunity, community)
+        await self.community_alert(ctx, TwitchCommunity, community.lower())
 
     @streamalert.command(name="hitbox")
     async def hitbox_alert(self, ctx, channel_name: str):
@@ -171,7 +171,7 @@ class Streams:
         for stream in self.streams:
             for channel_id in stream.channels:
                 if channel_id in guild_channels_ids:
-                    streams_list[channel_id].append(stream.name)
+                    streams_list[channel_id].append(stream.name.lower())
 
         if not streams_list:
             await ctx.send("There are no active stream alerts in this server.")
@@ -185,7 +185,7 @@ class Streams:
             await ctx.send(page)
 
     async def stream_alert(self, ctx, _class, channel_name):
-        stream = self.get_stream(_class, channel_name)
+        stream = self.get_stream(_class, channel_name.lower())
         if not stream:
             token = await self.db.tokens.get_attr(_class.__name__)
             stream = _class(name=channel_name,
@@ -365,12 +365,12 @@ class Streams:
             # isinstance will always return False
             # As a workaround, we'll compare the class' name instead.
             # Good enough.
-            if stream.type == _class.__name__ and stream.name == name:
+            if stream.type == _class.__name__ and stream.name.lower() == name.lower():
                 return stream
 
     def get_community(self, _class, name):
         for community in self.communities:
-            if community.type == _class.__name__ and community.name == name:
+            if community.type == _class.__name__ and community.name.lower() == name.lower():
                 return community
 
     async def check_exists(self, stream):
@@ -480,7 +480,14 @@ class Streams:
             token = await self.db.tokens.get_attr(_class.__name__)
             streams.append(_class(token=token, **raw_stream))
 
-        return streams
+        # issue 1191 extended resolution: Remove this after suitable period
+        # Fast dedupe below
+        seen = set()
+        seen_add = seen.add
+        return [x for x in streams
+                if not (x.name.lower() in seen or seen_add(x.name.lower()))]
+
+        # return streams
 
     async def load_communities(self):
         communities = []
@@ -493,7 +500,13 @@ class Streams:
             token = await self.db.tokens.get_attr(_class.__name__)
             communities.append(_class(token=token, **raw_community))
 
-        return communities
+        # issue 1191 extended resolution: Remove this after suitable period
+        # Fast dedupe below
+        seen = set()
+        seen_add = seen.add
+        return [x for x in communities
+                if not (x.name.lower() in seen or seen_add(x.name.lower()))]
+        # return communities
 
     async def save_streams(self):
         raw_streams = []