Sebastian Lang (born 15 September 1979, in Sonneberg) is a former German professional road bicycle racer and time trialist, who rode as a professional between 2002 and 2011. He rode on Gerolsteiner from 2002 until its demise in 2008, and in 2006 became Germany's national time trial champion. In 2011, Lang started and finished all three Grand Tours for Omega Pharma–Lotto, only the 31st rider to achieve this feat. He retired at the end of that season, aged 32.