Roos Jonker (born 1980 in Leiden, Netherlands) is a Dutch jazz singer based in Amsterdam. A graduate of the Amsterdam Conservatory, her début album Mmmmm, came out in 2010, to critical acclaim and considerable commercial success. She sang with prominent Dutch artists such as Benny Sings and Benjamin Herman before releasing another album in 2020, this time in collaboration with Dean Tippet, entitled Roos Jonker & Dean Tippet.