Gerrit Jan 'Gert-Jan' Liefers (born 26 September 1978 in Apeldoorn, Gelderland) is a former Dutch middle distance runner, who came 8th in the 1500 m final at the 2004 Olympics.

He was also a finalist in the same event in the 2001 and 2003 World Championships.

Liefers finished 8th in the 5000 m final at the 2006 European Athletics Championships in Gothenburg.

He is the Dutch record holder at 1500 m, the mile and 3000 m. This biographical article relating to Dutch athletics is a stub.

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