Betoi (Betoy) or Betoi-Jirara is an extinct language of Colombia and Venezuela, south of the Apure River near the modern border with Colombia. The names Betoi and Jirara are those of two of its peoples/dialects; the language proper has no known name. At contact, Betoi was a local lingua franca spoken between the Uribante and Sarare rivers and along the Arauca. Enough was recorded for a brief grammatical monograph to be written.

Betoi is generally seen as an isolate, though Kaufman (2007) included it in Macro-Paesan.

Zamponi (2017) finds enough lexical resemblances between Betoi and the Saliban languages to conclude that a genealogical relationship is plausible.

Historically, Betoi was considered a Tucanoan language, hence the original name Betoyan for the family.

Historically a dialect cluster, varieties include Betoi, Jirara, Situfa, Ayrico, Ele, Lucalia, Jabúe, Arauca, Quilifay, Anabali, Lolaca, and Atabaca.

Below is a full list of Betoi varieties listed by Loukotka (1968), including names of unattested varieties.

Glottolog groups Betoi dialects as follows:

Betoi appears to have a 5-vowel system, as illustrated below.