Knatchbull is a surname. Notable people with the surname include:
Adrian Knatchbull-HugessenAlexandra KnatchbullDora Knatchbull, married name of Dora Bright (1862–1951), English composer and pianistDoreen Knatchbull, Baroness BrabourneEdward Knatchbull (disambiguation), various peopleEdward Knatchbull-Hugessen, 1st Baron BrabourneJohn Knatchbull, 7th Baron BrabourneLeonora KnatchbullMichael KnatchbullMichael Knatchbull, 5th Baron BrabourneNicholas KnatchbullNorton Knatchbull (disambiguation), various peoplePatricia Knatchbull, 2nd Countess Mountbatten of Burma