Isitt is an English surname. It may refer to:
Debbie Isitt, English director and writer Frank Isitt (1843–1916), New Zealand Methodist minister Kate Isitt (journalist) (1876–1948), New Zealand journalist and writer Kate Isitt, English actress Leonard Isitt (minister) (1855–1937), New Zealand Methodist minister and politician Sir Leonard Isitt (aviator) (1891–1976), New Zealand military aviator and administrator