Fakhreddine Ben Youssef (; born 23 June 1991) is a Tunisian footballer who plays as a striker for US Monastir.
Ben Youssef started his career playing for CS Sfaxien, in which he was loaned out to Metz. He then played for ES Tunis, before joining Saudi club Al-Ettifaq. He later had chosen to terminate his contract with his team Al-Ettifaq. In January 2020, he joined Egyptian club Al-Ismaily, then he rejoined them in November after being a free agent since summer, before moving to the newly founded Pyramids FC in 2021.
Ben Youssef was a member of the Tunisian squad at the 2013 Africa Cup of Nations.
In June 2018, he was named in Tunisia's 23-man squad for the 2018 FIFA World Cup in Russia. He scored an equalizer in Tunisia's last group stage match against Panama. This goal was the 2,500th goal in FIFA World Cup history.