Guy Marcel Roux (French pronunciation: ?[gi ?u]; born 18 October 1938) is a French former football player and manager known for being in charge of French side AJ Auxerre for the remarkable period of more than 40 years and for leading the once humble amateur team to national and worldwide prominence.
A native of Colmar, Roux played for AJ Auxerre between 1954 and 1957 and became player-manager of the then Division d'Honneur (fourth level) club in 1961 to become its living legend and symbol.
In 1970 Auxerre got promoted to the Division 3 League, and Roux retired as a player.
In 1974 Auxerre got promoted again, this time to Division 2.
With Roux in charge the team made it to a Coupe de France final in 1979 and progressed to Division 1 in 1980.
The team then went further to clinch the Division 1 title in 1995–96 and win the Coupe de France four times (1993–94, 1995–96, 2002–03, 2004–05).
Among AJ Auxerre's honours under Roux are also an Intertoto Cup triumph and the 1992–93 UEFA Cup semi-final.