Sebastian Mielitz is a German Goalkeeper playing for SV Werder Bremen.

Sebastian Mielitz began his football career at Eintracht Oranienburg, moving later to MSV Neuruppin and Energie Cottbus. In 2005, he joined the youth team of SV Werder Bremen. On 10 November 2007, he debuted for the second team of Werder Bremen in the second half of a match, replacing the injured first-choice goalkeeper Nico Pellatz. In August 2008, Mielitz extended his contract until 2010. His professional debut in the 3. Liga was on 16 August 2008 against SSV Jahn Regensburg.