Michael "Jack" Holt (14 November 1879 – 10 June 1951) was an Australian horse trainer and philanthropist.

Popularly known as the "Wizard of Mordialloc", Holt headed the Victorian trainers' premiership at least twelve times.

He first trained horses at Berwick, Victoria, and won his first race, the 1911 Standish Handicap, with his own mare, Carette.

Some of his more notable wins were: Other horses he trained were: Avenger, Beau Fils, David, El Ray, Gallantic, Hyperion, Idea, King Pan, Man at Arms, Metellus, Radiant Lady, Royal Joker, Sailing Home, Sir Ibex, Smoke Bomb, Studio and Victorian King.

When he died he was accorded a Requiem Mass at his local church, St. Brigid's, Mordialloc, to which he had been a faithful and generous adherent.