Sigrun Grau (née Ludwigs, then Wodars, born 7 November 1965) is an East German former middle distance athlete who was born Sigrun Ludwigs in Neu Kaliß, Mecklenburg-Vorpommern. She started out as a 400 m hurdler in Schwerin and finished fourth at the 1981 European Junior Championships. She then switched clubs and changed to the 800 m like her new club mate, Christine Wachtel, who would also become her closest rival.