Petra Schersing (née Müller, born 18 July 1965 in Quedlinburg) is a retired East German sprinter who specialised in the 400 metres.

She represented sports club SC Chemie Halle and was coached by Harold Werner.

As Petra Muller, she first achieved international recognition, when she became the 1983 European Junior Champion at 400 metres.

In 1986, at the European Indoor Championships, she won a silver medal behind teammate Sabine Busch.

In 1990, now competing as Petra Schersing, she won a silver medal at the European Championships in Split, finishing behind her teenage teammate Grit Breuer and won a gold medal in the relay, with new teammates Manuela Derr, Annett Hesselbarth and Breuer.