Daniël ("Daan") de Groot (25 May 1933 – 8 January 1982) was a road bicycle and track cyclist from the Netherlands, who represented his native country at the 1952 Summer Olympics in Helsinki, Finland.

[1] In the 1952 Olympics, De Groot was eliminated in the quarterfinals of the men's 4,000 m team pursuit, alongside Adrie Voorting, Jan Plantaz and Jules Maenen.

When he passed a field with cabbage, he took two leaves and put them in his neck and on his head, to protect him from the sun.

[2] His sister Jannie competed as a swimmer for the Netherlands at the 1948 Summer Olympics.

[1] De Groot committed suicide in 1982, a year after his wife had died.