diff --git a/icu4c/source/i18n/unicode/numberformatter.h b/icu4c/source/i18n/unicode/numberformatter.h
index 5316d9aca0b..06329b8e7aa 100644
--- a/icu4c/source/i18n/unicode/numberformatter.h
+++ b/icu4c/source/i18n/unicode/numberformatter.h
@@ -1309,13 +1309,13 @@ class U_I18N_API Grouper : public UMemory {
               fGrouping2(grouping2),
               fMinGrouping(minGrouping),
               fStrategy(strategy) {}
-#endif  // U_HIDE_INTERNAL_API
 
     /** @internal */
     int16_t getPrimary() const;
 
     /** @internal */
     int16_t getSecondary() const;
+#endif  // U_HIDE_INTERNAL_API
 
   private:
     /**
@@ -1379,10 +1379,10 @@ class U_I18N_API Padder : public UMemory {
 
     /** @internal */
     static Padder codePoints(UChar32 cp, int32_t targetWidth, UNumberFormatPadPosition position);
-#endif  // U_HIDE_INTERNAL_API
 
     /** @internal */
     static Padder forProperties(const DecimalFormatProperties& properties);
+#endif  // U_HIDE_INTERNAL_API
 
   private:
     UChar32 fWidth;  // -3 = error; -2 = bogus; -1 = no padding
diff --git a/icu4c/source/i18n/unicode/plurfmt.h b/icu4c/source/i18n/unicode/plurfmt.h
index 2c2116586f6..fd60857b065 100644
--- a/icu4c/source/i18n/unicode/plurfmt.h
+++ b/icu4c/source/i18n/unicode/plurfmt.h
@@ -587,7 +587,7 @@ private:
      */
     static int32_t findSubMessage(
          const MessagePattern& pattern, int32_t partIndex,
-         const PluralSelector& selector, void *context, double number, UErrorCode& ec); /**< @internal */
+         const PluralSelector& selector, void *context, double number, UErrorCode& ec);
 
     void parseType(const UnicodeString& source, const NFRule *rbnfLenientScanner,
         Formattable& result, FieldPosition& pos) const;
diff --git a/icu4c/source/i18n/unicode/timezone.h b/icu4c/source/i18n/unicode/timezone.h
index f718be02a9b..90e5f254f48 100644
--- a/icu4c/source/i18n/unicode/timezone.h
+++ b/icu4c/source/i18n/unicode/timezone.h
@@ -317,6 +317,7 @@ public:
      */
     static TimeZone* U_EXPORT2 createDefault(void);
 
+#ifndef U_HIDE_INTERNAL_API
     /**
      * If the locale contains the timezone keyword, creates a copy of that TimeZone.
      * Otherwise, create the default timezone.
@@ -327,6 +328,7 @@ public:
      * @internal
      */
     static TimeZone* U_EXPORT2 forLocaleOrDefault(const Locale& locale);
+#endif  /* U_HIDE_INTERNAL_API */
 
     /**
      * Sets the default time zone (i.e., what's returned by createDefault()) to be the