diff --git a/icu4c/source/common/caniter.cpp b/icu4c/source/common/caniter.cpp
index f8c965d0771..e1742a8c5af 100644
--- a/icu4c/source/common/caniter.cpp
+++ b/icu4c/source/common/caniter.cpp
@@ -624,7 +624,7 @@ Hashtable *CanonicalIterator::extract(UChar32 comp, const UChar *segment, int32_
 
             if (decompPos == decompLen) { // done, have all decomp characters!
                 //u_strcat(buff+bufLen, segment+i);
-                memcpy(buff+bufLen, segment+i, (segLen-i)*sizeof(UChar));
+                uprv_memcpy(buff+bufLen, segment+i, (segLen-i)*sizeof(UChar));
                 bufLen+=segLen-i;
 
                 ok = TRUE;
diff --git a/icu4c/source/i18n/ucol.cpp b/icu4c/source/i18n/ucol.cpp
index 2d4e8a49276..e369b7b6a8c 100644
--- a/icu4c/source/i18n/ucol.cpp
+++ b/icu4c/source/i18n/ucol.cpp
@@ -6552,7 +6552,7 @@ ucol_safeClone(const UCollator *coll, void *stackBuffer, int32_t * pBufferSize,
         }
     } else {
         localCollator = (UCollator *)stackBuffer;
-        memcpy(localCollator, coll, sizeof(UCollator));
+        uprv_memcpy(localCollator, coll, sizeof(UCollator));
         localCollator->freeOnClose = FALSE;
 		localCollator->requestedLocale = NULL; // zero copies of pointers
 		localCollator->validLocale = NULL;
diff --git a/icu4c/source/i18n/ucol_elm.cpp b/icu4c/source/i18n/ucol_elm.cpp
index ad69f23352d..1acd4f98c7b 100644
--- a/icu4c/source/i18n/ucol_elm.cpp
+++ b/icu4c/source/i18n/ucol_elm.cpp
@@ -1325,7 +1325,7 @@ uprv_uca_assembleTable(tempUCATable *t, UErrorCode *status) {
     /* copy expansions */
     /*myData->expansion = (uint32_t *)dataStart+tableOffset;*/
     myData->expansion = tableOffset;
-    memcpy(dataStart+tableOffset, expansions->CEs, expansions->position*sizeof(uint32_t));
+    uprv_memcpy(dataStart+tableOffset, expansions->CEs, expansions->position*sizeof(uint32_t));
     tableOffset += (uint32_t)(paddedsize(expansions->position*sizeof(uint32_t)));
 
     /* contractions block */
@@ -1333,13 +1333,13 @@ uprv_uca_assembleTable(tempUCATable *t, UErrorCode *status) {
       /* copy contraction index */
       /*myData->contractionIndex = (UChar *)(dataStart+tableOffset);*/
       myData->contractionIndex = tableOffset;
-      memcpy(dataStart+tableOffset, contractions->codePoints, contractionsSize*sizeof(UChar));
+      uprv_memcpy(dataStart+tableOffset, contractions->codePoints, contractionsSize*sizeof(UChar));
       tableOffset += (uint32_t)(paddedsize(contractionsSize*sizeof(UChar)));
 
       /* copy contraction collation elements */
       /*myData->contractionCEs = (uint32_t *)(dataStart+tableOffset);*/
       myData->contractionCEs = tableOffset;
-      memcpy(dataStart+tableOffset, contractions->CEs, contractionsSize*sizeof(uint32_t));
+      uprv_memcpy(dataStart+tableOffset, contractions->CEs, contractionsSize*sizeof(uint32_t));
       tableOffset += (uint32_t)(paddedsize(contractionsSize*sizeof(uint32_t)));
     } else {
       myData->contractionIndex = 0;
@@ -1349,7 +1349,7 @@ uprv_uca_assembleTable(tempUCATable *t, UErrorCode *status) {
     /* copy mapping table */
     /*myData->mappingPosition = dataStart+tableOffset;*/
     /*myData->mappingPosition = tableOffset;*/
-    /*memcpy(dataStart+tableOffset, flattened, mappingSize);*/
+    /*uprv_memcpy(dataStart+tableOffset, flattened, mappingSize);*/
 
     myData->mappingPosition = tableOffset;
     utrie_serialize(mapping, dataStart+tableOffset, toAllocate-tableOffset, getFoldedValue, FALSE, status);
diff --git a/icu4c/source/i18n/ucol_tok.cpp b/icu4c/source/i18n/ucol_tok.cpp
index 874e7b9653b..698374eb04b 100644
--- a/icu4c/source/i18n/ucol_tok.cpp
+++ b/icu4c/source/i18n/ucol_tok.cpp
@@ -1369,8 +1369,8 @@ uint32_t ucol_tok_assembleTokenList(UColTokenParser *src, UParseError *parseErro
           } else if(sourceToken->expansion == 0) { /* if there is no expansion, implicit is just added to the token */
             sourceToken->expansion = expandNext;
           } else { /* there is both explicit and implicit expansion. We need to make a combination */
-            memcpy(src->extraCurrent, src->source + (expandNext & 0xFFFFFF), (expandNext >> 24)*sizeof(UChar));
-            memcpy(src->extraCurrent+(expandNext >> 24), src->source + src->parsedToken.extensionOffset, src->parsedToken.extensionLen*sizeof(UChar));
+            uprv_memcpy(src->extraCurrent, src->source + (expandNext & 0xFFFFFF), (expandNext >> 24)*sizeof(UChar));
+            uprv_memcpy(src->extraCurrent+(expandNext >> 24), src->source + src->parsedToken.extensionOffset, src->parsedToken.extensionLen*sizeof(UChar));
             sourceToken->expansion = (uint32_t)(((expandNext >> 24) + src->parsedToken.extensionLen)<<24 | (src->extraCurrent - src->source));
             src->extraCurrent += (expandNext >> 24) + src->parsedToken.extensionLen;
           }