Sylvia Thier (née Kühnemund; born 25 July 1974 in Sangerhausen) is a retired German athlete who competed primarily in the 1500 metres events. She represented her country at the 1996 Summer Olympics and 1997 World Championships without qualifying for the final. Most of her successes came indoors where she made it to the final at the 1997 and 1999 World Indoor Championships, as well as at the 1996 and 1998 European Indoor Championships.