Erik Tammer (born 29 June 1969) is a Dutch former professional footballer who played as a striker. He is the current co-owner of USL League Two club Dayton Dutch Lions.

Tammer played youth football with VV de Meeuwen, DSO/Ultrajectum, UVV and Ajax. He experienced his senior breakthrough at Excelsior, where he became the 1991–92 Eerste Divisie top goalscorer, and subsequently was mostly known for his stint with Heerenveen.^[1] There, he reached promotion to the Eredivisie and during the same season reached the KNVB Cup final, which was eventually lost to his former club Ajax.^[2]

Tammer also experienced success at Go Ahead Eagles, and almost made a move to Spanish club Osasuna. The transfer did not go through in the end, as representatives of Osasuna believed that Tammer had made negative comments about the club.^[3][4] Tammer ended his professional career as a forward in 2001 after 322 games and 154 goals. After this, he continued playing at amateur level,^[2] where he retired as part of HBS Craeyenhout in 2010, where he was also an assistant coach in his last season due to injuries.^[4]

After his career, Tammer founded his own sports management company. In April 2006, he founded a job site for the sports industry with a partner. The purpose of the vacancy bank was to bring former professional athletes and the business community into contact with each other.^[5]

In November 2009, Tammer became co-owner of the American association football clubs Dayton Dutch Lions and Houston Dutch Lions. He was also a scout for Heerenveen since 2013. From July 2015, he became a scout for Eredivisie club NEC.^[5] Since July 2018, he became a scout for Utrecht.^[6][7]