The Nubi language (also called Ki-Nubi, Arabic: كي-نوبي, romanized: kī-nūbī) is a Sudanese Arabic-based creole language spoken in Uganda around Bombo, and in Kenya around Kibera, by the Ugandan Nubians, many of whom are descendants of Emin Pasha's Sudanese soldiers who were settled there by the British colonial administration. It was spoken by about 15,000 people in Uganda in 1991 (according to the census), and an estimated 10,000 in Kenya; another source estimates about 50,000 speakers as of 2001. 90% of the lexicon derives from Arabic, but the grammar has been simplified, as has the sound system. Nairobi has the greatest concentration of Nubi speakers. Nubi has the prefixing, suffixing and compounding processes also present in Arabic.

Many Nubi speakers are Kakwa who came from the Nubian region, first into Equatoria, and from there southwards into Uganda and the Democratic Republic of the Congo. They rose to prominence under Ugandan President Idi Amin, who was Kakwa.

Jonathan Owens argues that Nubi constitutes a major counterexample to Derek Bickerton's theories of creole language formation, showing "no more than a chance resemblance to Bickerton's universal creole features" despite fulfilling perfectly the historical conditions expected to lead to such features.