Romuald Désiré Peiser (born 3 August 1979) is a French former professional footballer who played as a goalkeeper. He currently serves as the goalkeeper coach for CF Montréal of Major League Soccer.

Peiser was born in Phalsbourg, Moselle. After unsuccessfully emerging through Paris Saint-Germain FC's youth system – only appeared for the reserves – he played in Germany with Bayer Leverkusen II and KFC Uerdingen, both in the lower leagues; subsequently, he spent one season in the Swiss Challenge League with FC Vaduz.

Peiser made his top flight debut in the 2003–04 campaign, only missing four Liga I games as FC Rapid București finished in third position. He returned to his country for the following four years, spending two apiece with Troyes AC and FC Gueugnon and being part of the former team's Ligue 1 roster in 2005–06 (no league appearances).

In 2008, aged 29, Peiser moved countries again, going on to start for both Portuguese sides he represented, Associação Naval 1º de Maio and Académica de Coimbra, both in the Primeira Liga.^[1][2][3] His first match in the competition took place on 4 October 2008 while at the service of the former, in a 1–1 home draw to C.F. Os Belenenses.^[4]

On 9 July 2014, Peiser signed with his first non-European club, joining Ottawa Fury FC of the North American Soccer League.^[5] In July of the following year, he broke a record in the competition – in both the original and modern-day incarnation – for the longest shutout record.^[6]

In December 2016, 37-year-old Peiser moved to fellow league team San Francisco Deltas.^[7] He won the Soccer Bowl in his first season, keeping a clean sheet in the decisive match against New York Cosmos (2–0 at the Kezar Stadium).^[8]

In March 2018, Peiser signed with United Soccer League side Penn FC.^[9] After retiring later in that year, he worked as goalkeeper coach at Sacramento Republic FC.^[10]

On June 4, 2021, he was hired to be the new goalkeeper coach for CF Montréal.^[11]