The Komo–Bira languages are part of the Bantu languages coded Zone D.20–30 in Guthrie's classification, specifically D.21, D.22, D.23, D.31, D.32. According to Nurse & Philippson (2003), they form a valid node; the rest of D.20 include the Lega–Holoholo languages, while the rest of the D.30 languages are not related to each other, apart from a close Budu–Ndaka group.

The Komo–Bira languages are:

• Komo
  Komo language (Bantu)
  Komo is a Bantu language spoken by half a million people in the Democratic Republic of the Congo, including an area around the major upriver port of Kisangani....
  
   (D.23)
• Bali (D.21), ?Beeke
  Beeke language
  Beeke is a Bantu language of uncertain affiliation. Guthrie assigned to the Nyali cluster. However, Ethnologue suggests that it may be a divergent form of Bali. It is 65% cognate with Bali, but 38% with the Nyali language Ndaka....
  
  
• Biran (Bira–Amba): Amba (Kwamba), Bhele
  Bhele language
  Bhele , or Piri , is a Bantu language of the Democratic Republic of the Congo....
  
   (Piri), Bila (Kango/Sua), Bera (Bira), Kaiku

In addition, Nurse & Philippson report that Bati–Angba (Bwa) languages

Bati–Angba languages

The Bati–Angba or Bwa languages are a clade of Bantu languages, about half of Zone C.40 in Guthrie's classification. According to Nurse & Philippson , they languages form a valid node. They are:...

 may be included. The resulting family is called Boan

Boan languages

Boan is a proposed intermediate group of Bantu languages coded Zones C and D in Guthrie's classification . There are three branches:*Komo *Bali , ?Beeke*Bomokandian...

. In the Boan proposal, however, Komo and Bali are the most divergent languages, and Bati–Angba is not a distinct branch, so Boan is technically a synonym for Komo–Bira.