Peter Maes (Dutch pronunciation: [ˈpeːtər ˈmaːs]; born 1 June 1964) is a Belgian professional football manager and former player who is the head coach of Eerste Divisie club Willem II.

Initially a backup, he eventually established himself as the team's first-choice goalkeeper, playing alongside teammates like Harm van Veldhoven, Patrick Goots, and Philip Haagdoren.

At Anderlecht, Maes was the understudy to Filip De Wilde,[9] seeing limited playing time but contributing to the team's success as they claimed the league title in 1991.

Despite competition from emerging talents like Frédéric Herpoel, Maes remained Anderlecht’s second-choice goalkeeper until 1995, winning four league titles during his time with the club.

[11] At Beveren, he was the first-choice goalkeeper for one season before transferring to Standard Liège to replace departing captain Gilbert Bodart, with Jean-François Gillet as his understudy.

[18][19] Under his leadership, and with key players such as Jonas Ivens, Koen Persoons, Björn Vleminckx, and Nana Asare, KV Mechelen established itself as a stable mid-table side in the Belgian Pro League.

He secured his first major trophy in 2012 when Lokeren defeated Kortrijk 1–0 in the Belgian Cup final, earning qualification for the UEFA Europa League.

[24] In the 2014–15 Europa League campaign, Maes guided Lokeren to the group stage after eliminating Hull City in the play-offs round.

On 22 October 2018, Belgian media reported that Maes had been arrested in connection with the "Operation Clean Hands" investigation into football fraud, involving his agent Dejan Veljković.

[38] On 16 September 2023, Eerste Divisie side Willem II introduced Maes as their new head coach, succeeding the departed Reinier Robbemond.