Henk Nijdam (26 August 1935 – 30 April 2009) was a Dutch road and track cyclist. On track, he finished in fifth place in the 4 km team pursuit at the 1960 Summer Olympics. He also won a gold and a bronze medals in the individual pursuit at world championships in 1962 and 1963.
His best achievements on the road were winning the Olympia's Tour in 1964 and two stages of the Tour de France in 1964 and 1966.
Nijdam was the father of cyclist Jelle Nijdam.