Miyauchi (written: 宮内) is a Japanese surname. Notable people with the surname include:

, Japanese actor and voice actor , Japanese actor , Japanese writer and activist , Japanese actor and voice actor , Japanese bobsledder , Japanese tennis player , Japanese singer , Japanese footballer , Japanese singer , Japanese businessman Haruka Miyauchi (宮内 晴香, born 1993), Japanese singer in GWSN

Fictional characters , a character in the manga series Non Non Biyori , protagonist of the manga series Inubaka