The Sira languages are a clade of Bantu languages coded Zone B.40 in Guthrie's classification. According to Nurse & Philippson (2003), together with a couple languages from H10, they form a valid node. They are:

(B.40) Punu

Punu language

Punu is a Bantu language spoken in Gabon and the Republic of Congo. Irimba is classified as a dialect, but may be relexified from a non-Bantu source....

, Bwisi

Bwisi language

Bwisi is a language spoken mainly in the Kibangou District of the Republic of Congo, next to the Gabon border, where it is also spoken by a minority. According to the Ethnologue, approximately 4,250 people speak the language today worldwide.-Bibliography:* , Ethnologue report-External links:* at...

, Varama, Vungu, Shira, Bwali, Sangu

Sangu language (Gabon)

Sangu is a language spoken in Gabon by approximately 20,900 Masangu people.-External links:* at WolframAlpha* from Google Books...

, Lumbu

Lumbu language

Lumbu is a Bantu language spoken in Gabon and the Republic of Congo....

, (H.10) Vili

Vili language

Vili is a Bantu language of Congo and Gabon....

, Kunyi.

In addition, the unclassified Pygmy language Rimba

Rimba language

Rimba is the speech variety of the Babongo-Rimba pygmies of Gabon. Generally considered a dialect of Punu, it may preserve a core of non-Bantu vocabulary, and so to be conservative should be considered unclassified.-References:...

(Irimba) is generally assumed to be a dialect of Punu.