Roelant Wouter Oltmans (born 25 May 1954) is a Dutch field hockey coach, who is the current head coach of the Pakistan national field hockey team.
Earlier he coached the Larensche Mixed Hockey Club men's team.
In 1993 he moved to the men's team, he won the gold medal at the 1996 Summer Olympics after defeating Spain 3–1 in the final.
Oltmans was appointed coach of the national team of Pakistan during the Olympic Games in Athens and held the position until the end of 2004.
He was the head coach of the Malaysia men's national hockey team until July 2020 when he resigned.