Marcelien Bos-de Koning (born 10 May 1978) is a Dutch three-time world champion and Olympic silver medalist sports sailor. She represented her country at the 2008 Summer Olympics in Qingdao. With crew member Lobke Berkhout Bos-de Koning took the silver medal as helmsman in the Women's 470. Bos-de Koning returned as crew member to the 2012 Olympic match regatta's in Weymouth in the Elliott 6m. With helmsman Renee Groeneveld and fellow crew member Annemieke Bes Bos-de Koning took 8th place.