Kurt Nielsen was a Danish tennis player. He was born in Copenhagen, and was the first Danish tennis player ever to have played in a men's singles final in a Grand Slam tournament.

Frederik Løchte Nielsen is a former professional tennis player. He was the top ranked player from Denmark in the ATP doubles world rankings. A former Wimbledon men's doubles champion, he peaked at no. 17 in the rankings in April 2013. Nielsen has reached five other doubles finals on tour, winning on two occasions.