The knockout stage of the 2011 CONCACAF Gold Cup started on June 18 and ended with the final on June 25, 2011. The group winners and runners-up and the two best third placed teams from the group stage qualified.
All times U.S. Eastern Daylight Time (UTC−4) (Local times in parentheses)
Assistant referees: Daniel Williamson (Panama) William Torres (El Salvador) Fourth official: Jair Marrufo (United States)
Assistant referees: Ricardo Morgan (Jamaica) Charles Morgante (United States) Fourth official: Joel Aguilar (El Salvador)
Assistant referees: José Luis Camargo Callado (Mexico) Alberto Morín Méndez (Mexico) Fourth official: Walter Lopez (Guatemala)
Assistant referees: Leonel Leal (Costa Rica) Oscar Velasquez (Honduras) Fourth official: Dave Gantar (Canada)
Assistant referees: Héctor Vergara (Canada) Leonel Leal (Costa Rica) Fourth official: Dave Gantar (Canada)
Assistant referees: Hermenerito Leal (Guatemala) Gerson Lopez (Guatemala) Fourth official: Joel Aguilar (El Salvador)
Assistant referees: Héctor Vergara (Canada) William Torres (El Salvador) Fourth official: Walter López Castellanos (Guatemala)