diff --git a/icu4c/source/i18n/number_capi.cpp b/icu4c/source/i18n/number_capi.cpp
index b91a9760e20..a35680a6200 100644
--- a/icu4c/source/i18n/number_capi.cpp
+++ b/icu4c/source/i18n/number_capi.cpp
@@ -317,11 +317,6 @@ usnum_setMaximumIntegerDigits(USimpleNumber* unumber, int32_t maximumIntegerDigi
     number->fNumber.setMaximumIntegerDigits(maximumIntegerDigits, *ec);
 }
 
-U_CAPI void U_EXPORT2
-usnum_truncateStart(USimpleNumber* unumber, int32_t maximumIntegerDigits, UErrorCode* ec) {
-    usnum_setMaximumIntegerDigits(unumber, maximumIntegerDigits, ec);
-}
-
 U_CAPI void U_EXPORT2
 usnum_setSign(USimpleNumber* unumber, USimpleNumberSign sign, UErrorCode* ec) {
     auto* number = USimpleNumberData::validate(unumber, *ec);
diff --git a/icu4c/source/i18n/number_simple.cpp b/icu4c/source/i18n/number_simple.cpp
index 7daeb66dc2a..4d8706d9bd0 100644
--- a/icu4c/source/i18n/number_simple.cpp
+++ b/icu4c/source/i18n/number_simple.cpp
@@ -108,10 +108,6 @@ void SimpleNumber::setMaximumIntegerDigits(uint32_t position, UErrorCode& status
     fData->quantity.applyMaxInteger(position);
 }
 
-void SimpleNumber::truncateStart(uint32_t position, UErrorCode& status) {
-    setMaximumIntegerDigits(position, status);
-}
-
 void SimpleNumber::setSign(USimpleNumberSign sign, UErrorCode& status) {
     if (U_FAILURE(status)) {
         return;
diff --git a/icu4c/source/i18n/unicode/simplenumberformatter.h b/icu4c/source/i18n/unicode/simplenumberformatter.h
index 5aa33c69468..d0121c2b97e 100644
--- a/icu4c/source/i18n/unicode/simplenumberformatter.h
+++ b/icu4c/source/i18n/unicode/simplenumberformatter.h
@@ -87,16 +87,6 @@ class U_I18N_API SimpleNumber : public UMemory {
     void setMaximumIntegerDigits(uint32_t maximumIntegerDigits, UErrorCode& status);
 #endif // U_HIDE_DRAFT_API
 
-#ifndef U_HIDE_DEPRECATED_API
-    /**
-     * Alias for setMaximumIntegerDigits.
-     * Will be removed after ICU 75.
-     *
-     * @deprecated ICU 75
-     */
-    void truncateStart(uint32_t maximumIntegerDigits, UErrorCode& status);
-#endif // U_HIDE_DEPRECATED_API
-
     /**
      * Pads the beginning of the number with zeros up to the given minimum number of integer digits.
      *
diff --git a/icu4c/source/i18n/unicode/usimplenumberformatter.h b/icu4c/source/i18n/unicode/usimplenumberformatter.h
index b67d7e56d59..22e81ba2c93 100644
--- a/icu4c/source/i18n/unicode/usimplenumberformatter.h
+++ b/icu4c/source/i18n/unicode/usimplenumberformatter.h
@@ -167,18 +167,6 @@ usnum_setMaximumIntegerDigits(USimpleNumber* unumber, int32_t maximumIntegerDigi
 #endif // U_HIDE_DRAFT_API
 
 
-#ifndef U_HIDE_DEPRECATED_API
-/**
- * Alias for setMaximumIntegerDigits.
- * Will be removed after ICU 75.
- *
- * @deprecated ICU 75
- */
-U_CAPI void U_EXPORT2
-usnum_truncateStart(USimpleNumber* unumber, int32_t maximumIntegerDigits, UErrorCode* ec);
-#endif  // U_HIDE_DEPRECATED_API
-
-
 /**
  * Sets the sign of the number: an explicit plus sign, explicit minus sign, or no sign.
  *