Robert Kiplagat Andersen (also known as Robert K. Andersen; born 12 December 1972) is a retired Kenyan-born middle-distance runner who ran internationally for Denmark.^[1] He competed in the 1500 metres at the 1995 World Championships, reaching the semifinals, and the 1997 World Championships, reaching the final.

Outdoor

• 800 metres – 1:46.47 (Malmö 1997)
• 1000 metres – 2:19.78 (Florø 1997)
• 1500 metres – 3:31.17 (Zürich 1997)
• One mile – 3:50.79 (Berlin 1997)
• 3000 metres – 8:09.98 (Malmö 2004)
• 5000 metres – 13:51.22 (Heusden-Zolder 2004)

Indoor

• 800 metres – 1:53.36 (Malmö 2001)
• 1000 metres – 2:24.22 (Erfurt 1997)
• 1500 metres – 3:39.78 (Stuttgart 1998)
• 3000 metres – 7:54.72 (Paris 1997)