Robert Stanjek (born 7 May 1981 in Rüdersdorf, Brandenburg) is a German sailor, who specialized in two-person keelboat (Star) class. He represented Germany, along with his partner Frithjof Kleen in the Star class at the 2012 Summer Olympics, and also captured a silver medal at the 2011 ISAF Sailing World Championships in Perth, Australia. Stanjek has also been training throughout most of his sporting career for the North German Sailing Regatta (German: Norddeutscher Regatta Verein) in Hamburg under his personal coach Alan Smith. As of November 2014, Stanjek is ranked eighth in the world for the two-person keelboat by the International Sailing Federation, following his first-place effort at the ISAF World Cup Series and Star World Championships in Malcesine, Italy.
Stanjek qualified as a skipper for the German squad in the Star class at the 2012 Summer Olympics in London by placing second and receiving a berth from the ISAF World Championships in Perth, Western Australia. Teaming with his partner Frithjof Kleen in the opening series, the German duo recorded a net score of 70 points throughout the entire race, but came up short for the medal podium with a satisfying sixth position against a fleet of sixteen boats.