diff --git a/indra/llcommon/llsdserialize.cpp b/indra/llcommon/llsdserialize.cpp
index 69e3ff266a8e62acfa2bf2218f1175b1a4e0fc11..10f460e8a6d0baf2ba038b517d093986659969be 100644
--- a/indra/llcommon/llsdserialize.cpp
+++ b/indra/llcommon/llsdserialize.cpp
@@ -71,7 +71,7 @@ void LLSDSerialize::serialize(const LLSD& sd, std::ostream& str, ELLSD_Serialize
 		break;
 
 	default:
-		llwarns << "serialize request for unkown ELLSD_Serialize" << llendl;
+		llwarns << "serialize request for unknown ELLSD_Serialize" << llendl;
 	}
 
 	if (f.notNull())
diff --git a/indra/llcommon/llstring.h b/indra/llcommon/llstring.h
index 88fecb57bf7f9158abb115746bbc569f99e5cf32..7e41e787b52814a97d590cf171463627b6602250 100644
--- a/indra/llcommon/llstring.h
+++ b/indra/llcommon/llstring.h
@@ -435,7 +435,7 @@ LL_COMMON_API bool iswindividual(llwchar elem);
  */
 
 // Make the incoming string a utf8 string. Replaces any unknown glyph
-// with the UNKOWN_CHARACTER. Once any unknown glph is found, the rest
+// with the UNKNOWN_CHARACTER. Once any unknown glyph is found, the rest
 // of the data may not be recovered.
 LL_COMMON_API std::string rawstr_to_utf8(const std::string& raw);
 
diff --git a/indra/newview/llgroupmgr.cpp b/indra/newview/llgroupmgr.cpp
index 85e45d012b5bcf9dfb7eef6b2fe165b835ff30b8..7546c070ea6070559d2a96611d897bc01b419a9b 100644
--- a/indra/newview/llgroupmgr.cpp
+++ b/indra/newview/llgroupmgr.cpp
@@ -1175,8 +1175,8 @@ void LLGroupMgr::processGroupRoleMembersReply(LLMessageSystem* msg, void** data)
 				}
 				else
 				{
-					if (!rd) llwarns << "Received role data for unkown role " << role_id << " in group " << group_id << llendl;
-					if (!md) llwarns << "Received role data for unkown member " << member_id << " in group " << group_id << llendl;
+					if (!rd) llwarns << "Received role data for unknown role " << role_id << " in group " << group_id << llendl;
+					if (!md) llwarns << "Received role data for unknown member " << member_id << " in group " << group_id << llendl;
 				}
 			}
 		}
diff --git a/indra/newview/llnotificationhandlerutil.cpp b/indra/newview/llnotificationhandlerutil.cpp
index b5683296ebf6c73e047357a20dcc60229ee6c38c..4231a73af1b977479e26c80e796c150bd2247160 100644
--- a/indra/newview/llnotificationhandlerutil.cpp
+++ b/indra/newview/llnotificationhandlerutil.cpp
@@ -353,7 +353,7 @@ void LLHandlerUtil::logGroupNoticeToIMGroup(
 	if (!gAgent.getGroupData(payload["group_id"].asUUID(), groupData))
 	{
 		llwarns
-						<< "Group notice for unkown group: "
+						<< "Group notice for unknown group: "
 								<< payload["group_id"].asUUID() << llendl;
 		return;
 	}