Douglas Kostynski (born February 23, 1963 in Castlegar, British Columbia) is a retired ice hockey centre. He was drafted by the Boston Bruins with the 186th overall pick in the 1982 NHL Entry Draft. He played 15 games for the Bruins, scoring 3 goals and an assist.
After being drafted by the Boston Bruins, Kostynski turned pro with the Hershey Bears in 1983-84. He was called up by the Bruins for brief spells in 1983-84 and 1984-85. He then played in 1985-86 and 1986-87 for the Moncton Golden Flames and in 1987-88 for the Adirondack Red Wings.