Ann Mercken (born 6 May 1974 in Hasselt[1]) is a retired Belgian athlete who specialised in the 400 metres hurdles.
[2] She represented her country at the 1996 Summer Olympics reaching the semifinals.
She also competed at the 1999 World Championships.
This was the national record until Paulien Couckuyt improved it to 54.90 at the 2020 Summer Olympics.
This biographical article relating to Belgian athletics is a stub.