Tidd is a surname. Notable people with the surname include:
Emmett H. Tidd (1923–2018), United States Navy vice admiral Kurt W. Tidd (born 1956), United States Navy admiral Mark L. Tidd (born 1955), United States Navy rear admiral William Tidd (1760–1847), legal writer
Fictional characters Leroy Tidd, a character in the television series Oz