Claudia Ștef, née Iovan (born 25 February 1978 in Craiova, Romania) is a Romanian women's professional race walker.

Ștef holds the world indoor record for 3000 metres track walk with 11:40.33 minutes, achieved in January 1999 in Bucharest.

[1] She tested positive for nandrolone in an out-of-competition test on 20 May 2000 and received a two-year doping ban.

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