Henry St John-Mildmay may refer to:
Sir Henry St John-Mildmay, 3rd Baronet (1764–1808), MP for Westbury, Hampshire and Winchester Sir Henry St John-Mildmay, 4th Baronet (1787–1848), MP for Winchester Sir Henry St John-Mildmay, 5th Baronet (1810–1902}, British Army officer Sir Henry St John-Mildmay, 6th Baronet (1853–1916), English cricketer and British Army officer
See also St John-Mildmay Baronets Henry St John (disambiguation) Henry Mildmay (disambiguation)