van der Gaag is a Dutch surname. Notable people with the surname include:
Anna van der Gaag, British speech and language therapist and academic Linda van der Gaag (born 1959), Dutch computer scientist Lotti van der Gaag (1923–1999), Dutch sculptor and painter Wim van der Gaag (born 1936), Dutch footballer and coach Mitchell van der Gaag (born 1971), Dutch footballer and coach, son of Wim Jordan van der Gaag (born 1999), Dutch footballer, son of Mitchell Lucas van der Gaag (born 2001), Dutch footballer, son of Mitchell
See also Van der Gaag Lane, road in Delft, Netherlands