Van der Knaap is a surname. Notable people with the surname include:
Astrid van der Knaap (born 1964), Dutch badminton player Cees van der Knaap (born 1951), Dutch politician David van der Knaap (born 1948), South African cricketer Marjo van der Knaap (born 1958), Dutch neurologist Richard van der Knaap (born 1947), South African cricketer