Jacob "Jaap" Stockmann (born 24 July 1984) is a retired Dutch field hockey player, who played as a goalkeeper for the Dutch national team.In 2008 he was the reserve goalkeeper in the Dutch team that came in fourth at the Olympic Games in Beijing.
At the 2012 Summer Olympics, where the Dutch team won the silver medal, he was the starting goalkeeper.
Stockmann has played for HC Bloemendaal in the Dutch League (Hoofdklasse).
With HC Bloemendaal, he won the Euro Hockey League in the 2008–09 and 2017–18 seasons.
He also played for the Punjab Warriors in the Hockey India League, and won the player of the tournament for the 2014 edition.