Sitwell is a surname. Notable people with the surname include:
A member of the Sitwell literary family: Edith Sitwell Osbert Sitwell Sacheverell Sitwell The Sitwell Baronets, holders of a hereditary baronetcy awarded by the British Crown Sir Sitwell Sitwell, 1st Baronet Sir George Sitwell, 2nd Baronet Sir Sitwell Reresby Sitwell, 3rd Baronet Sir George Reresby Sitwell, 4th Baronet Sir (Francis) Osbert Sitwell, 5th Baronet Sir Sacheverell Sitwell, 6th Baronet Sir Sacheverell Reresby Sitwell, 7th Baronet Sir George Reresby Sitwell, 8th Baronet
Fictional characters Jasper Sitwell, a comic book espionage agent in the Marvel Comics universe Stan Sitwell, a character from the Fox television comedy series Arrested Development