Peninah Arusei Jerop (born 1 January 1979) is a Kenyan professional long-distance runner who specialises in road running competitions, especially the half marathon. She has represented Kenya at the Olympics, having competed in the 10,000 metres race at the 2008 Beijing Olympics. Arusei has won races on the European road circuit, including the Dam tot Damloop, Berlin Half Marathon and Lisbon Half Marathon.