Jan Poštulka (born 9 March 1949) is a Czech former football player and later coach.
As a head coach, he enjoyed his greatest success in Central America (Champion of Central America, Champion of Costa Rica, Guatemala Cup Winner, LG Cup Winner) where he worked in the 1990s with the L.D.Alajuelense.
He managed FC Banants Yerevan to victory in the 2007 Armenian Cup.
[1] Fair Play prize of the Czech Olympic Committee for lifetime contribution.
His son Tomáš Poštulka is a goalkeeper, playing notably for Sparta Prague.