Frederick Theodore Hack (24 August 1877 – 10 April 1939) was a cricketer who played first-class cricket for South Australia from 1898 to 1909.

An opening batsman, Hack scored 33, 115, 54, 37, 44 and 158 not out in the 1899-1900 Sheffield Shield, a total of 441 runs at an average of 88.20, putting him at the top of the Shield averages.^[1] The cricket writer A. G. Moyes said of Hack's career that he did "grand service for [South Australia] as an opening batsman. Standing a few inches over six feet, he was an extremely difficult man to dislodge once he dug in his heels. Never quite Test class, he was nevertheless a remarkably handy man for the ordinary first-class game."^[2] He continued playing senior cricket in Sydney into the 1920s.^[3]

For some years Hack was the managing director of his own company, F. T. Hack Limited, which manufactured automobiles in Adelaide.^[4] After he left Adelaide to take up business in Sydney in 1917, the company's premises were bought by Holden.^[5][6] In 1924 he was manager of the Missenden Road Body Building Works in the Sydney suburb of Camperdown.^[7]

He and his wife had two daughters and two sons, Alfred and Reginald, both of whom played cricket for South Australia.^[8][9]