diff --git a/source/common/uchar.c b/source/common/uchar.c
index 08a23deaa84..2ecf49590ab 100644
--- a/source/common/uchar.c
+++ b/source/common/uchar.c
@@ -5174,9 +5174,7 @@ u_charDigitValue(UChar ch)
 void
 createTables()
 {
-    Mutex* lock = NULL;
     CompactByteArray* newTables;
-	lock = NULL;
     if (tables == 0) {
       newTables = ucmp8_openAdopt((uint16_t*)indicies, (int8_t*)values, offsetCount);    
       umtx_lock(NULL);
@@ -5225,7 +5223,6 @@ createUlTables()
 void
 createDirTables()
 {
-  Mutex* lock=NULL;
   CompactByteArray* newTables;
   if (dirTables == 0)
     {
diff --git a/source/common/ucnv.c b/source/common/ucnv.c
index 655ecbc3fe8..fb4bab88a78 100644
--- a/source/common/ucnv.c
+++ b/source/common/ucnv.c
@@ -222,8 +222,6 @@ UConverter*  ucnv_openCCSID (int32_t codepage,
 
 void ucnv_close (UConverter * converter)
 {
-  Mutex *updateReferenceCounterMutex = NULL;
-
   if (converter == NULL)
     return;
   if ((converter->sharedData->conversionType == UCNV_ISO_2022) &&
@@ -248,7 +246,6 @@ int32_t  ucnv_flushCache ()
   UConverterSharedData *mySharedData = NULL;
   int32_t pos = -1;
   int32_t tableDeletedNum = 0;
-  Mutex *flushCacheMutex = NULL;
 
   /*if shared data hasn't even been lazy evaluated yet
    * return 0
diff --git a/source/common/ucnv_bld.c b/source/common/ucnv_bld.c
index 95ea1ee2421..8e8b911fc31 100644
--- a/source/common/ucnv_bld.c
+++ b/source/common/ucnv_bld.c
@@ -414,7 +414,6 @@ int32_t uhash_hashSharedData (void *sharedData)
 /*Puts the shared data in the static hashtable SHARED_DATA_HASHTABLE */
 void   shareConverterData (UConverterSharedData * data)
 {
-  Mutex *sharedData = NULL;
   UErrorCode err = U_ZERO_ERROR;
   /*Lazy evaluates the Hashtable itself */
 
@@ -506,7 +505,6 @@ int32_t uhash_hashIString(const void* name)
 }
 bool_t   isDataBasedConverter (const char *name)
 {
-  Mutex *createHashTableMutex = NULL;
   int32_t i = 0;
   bool_t result = FALSE;
   UErrorCode err = U_ZERO_ERROR;
@@ -567,7 +565,6 @@ UConverter *
   char realName[UCNV_MAX_CONVERTER_NAME_LENGTH];
   UConverter *myUConverter = NULL;
   UConverterSharedData *mySharedConverterData = NULL;
-  Mutex *updatingReferenceCounterMutex = NULL;
 
   if (U_FAILURE (*err))
     return NULL;
diff --git a/source/common/ucnv_io.c b/source/common/ucnv_io.c
index 74d95e5d43a..e6bc397bd3e 100644
--- a/source/common/ucnv_io.c
+++ b/source/common/ucnv_io.c
@@ -144,7 +144,6 @@ void
 void 
   doSetupAliasTableAndAvailableConverters (FileStream * converterFile, UErrorCode * err)
 {
-  Mutex *convertrsFileOpenMutex = NULL;
   char myLine[UCNV_MAX_LINE_TEXT];
   char *line = myLine;
   char actualNameToken[UCNV_MAX_CONVERTER_NAME_LENGTH];