Keiga, Yega, or Deiga is a Nilo-Saharan language of the Kadu branch spoken in South Kordofan, Sudan. Dialects are Demik (Rofik) and Keiga proper (Aigang).

Keiga is a VSO language. Reh (1994) instead uses the name Deiga or Dayga, with a prefix d- instead of the place prefix k-.

Stevenson (1956; 1957) originally called the language Keiga, after the places where it is mainly spoken, namely Keiga Timmero, Keiga al-Kheil and Keiga Lubun. The local name for the language is sani m-aigaŋ 'speech of Keiga' (Stevenson 1956: 104). Stevenson (1956: 104) considers it to be a language cluster consisting of two dialects, Keiga proper and Demik, with a total number of approximately 7,520 speakers (with 1,504 taxpayers).

Keiga is spoken in the following villages according to the 22nd edition of Ethnologue:

Blench (2005) identified three dialects, which are Àmbóŋ, Lùbúŋ, and Tʊ̀mʊ̀rɔ̀.

Àmbóŋ villages are as follows. Only Taffor, Kantang, Lak ka aati, and Arungek ka aati villages were reported by Blench (2005) to be inhabited. The rest were abandoned due to the Sudanese Civil War.

Lùbúŋ villages are as follows. Only Küwëk is inhabited.

Tʊ̀mʊ̀rɔ̀ villages are as follows. Only Koolo is inhabited.