Martina Moravcová (born 16 January 1976 in Pieštany, Trnava, Czechoslovakia) is a medley, butterfly and freestyle swimmer from Slovakia.
She made her international swimming debut in 1991 for Czechoslovakia, and has gone on to compete in five consecutive Summer Olympics (1992–2008).
She is a two-time Olympic silver medalist, both achieved at the 2000 Summer Olympics in Sydney, Australia.
In the 100-meter butterfly, she finished second to Inge de Bruijn, and in the 200-meter freestyle, she finished eight one-hundredths of a second to home favorite Susie O'Neill.