Filip Cristian Jianu (born 18 September 2001) is a Romanian tennis player. Jianu has a career high ATP singles ranking of No. 284 achieved on 15 August 2022 and a doubles ranking of No. 639 achieved on 28 November 2022. Jianu has a career high ITF junior ranking of No. 5 achieved on 4 February 2019. Jianu represents Romania at the Davis Cup.