Willem Geubbels (born 16 August 2001) is a French footballer who plays as forward for Monaco in Ligue 1.
Geubbels started his playing career at Lyon's academy. He made his first team debut on 23 September 2017 in a 3–3 home draw against Dijon in Ligue 1. He entered the field after 84 minutes, replacing Lucas Tousart. In doing so, Geubbels became the first player born in the 21st century to appear in Ligue 1, as well as the 5th youngest player ever to make a Ligue 1 debut at 16 years, one month and seven days old. On 7 December, Geubbels came on for an injured Maxwel Cornet in the 45+1' minute of a 1–0 away loss to Atalanta in the Europa League. In doing so, Geubbels once again became the first player born in the 21st century to appear in the UEFA Europa League as well as the youngest player ever to make a Europa League debut at 16 years and 113 days old.
On 19 June 2018, Geubbels signed with fellow Ligue 1 side Monaco for 20 million euros.