Nicholas David Ionel (born 12 October 2002) is a Romanian professional tennis player. He has a career high ATP singles ranking of No. 184 achieved on 12 June 2023. He also has a career high ATP doubles ranking of No. 356 achieved on 24 April 2023. He is currently the No. 2 Romanian player.
Ionel won the 2020 Australian Open – Boys' doubles title.
Ionel was awarded with a qualification wildcard to play his first ATP tournament at the 2020 European Open, where he pushed former world No. 36 Yūichi Sugita to three sets.
He reached the top 250 in singles on 7 November 2022 at No. 241.