Marcelien Bos-de Koning (born 10 May 1978) is a Dutch three-time world champion and Olympic silver medalist sports sailor.

With crew member Lobke Berkhout Bos-de Koning took the silver medal as helmsman in the Women's 470.

[3][4] Bos-de Koning returned as crew member to the 2012 Olympic match regatta's in Weymouth in the Elliott 6m.

[5][6] With helmsman Renee Groeneveld and fellow crew member Annemieke Bes Bos-de Koning took 8th place.

[7] Bos-de Koning held the following positions within the International Sailing Federation:[8] Source:[9]