Abubaker Kaki Khamis (Arabic: أبو بكر خميس كاكي; born 21 June 1989) is a Sudanese runner who specializes in the 800 metres.

On March 9, 2008, in Valencia, Kaki became the youngest ever World Indoor champion after winning the 800 m final at age 18 years and 262 days.

[3] On June 6, 2008, he won the Bislett Games Golden League meeting in Oslo by running 1:42.69, a new world junior record.

Kaki retained his title at the 2010 IAAF World Indoor Championships at the age of twenty, becoming only the second athlete after Paul Ereng to complete the feat in the men's 800 m. In the outdoor season, he made his first appearance in the 2010 IAAF Diamond League in an 800 m match-up against David Rudisha.

Both runners defeated Sebastian Coe's 31-year-old meeting record, but Kaki was not fast enough to beat Rudisha.