- Language: Mser
- Alternate names: Kotoko-Kuseri, Kuseri, Kouseri, Kousseri, Mandage, Klesem, Mandague, Mendage
- Language code: kqx
- Language family: Afro-Asiatic, Chadic, Biu-Mandara, B, B.1, Kotoko Proper, South (SIL classification)
- Number of speakers: 500
- Vulnerability: Endangered
- Script: Unwritten.
‘Mandage’ is used by the Kotoko to refer to either the northern group of Kotoko languages (Mpade (See: [[Mpade]]), Afade (See: [[Afade]]), Maslam (See: [[Maslam]]), Malgbe (See: [[Malgbe]])) or the Kotoko group as a whole (including Mser (See: [[Mser]]) and Lagwan (See: [[Malgbe]])). Muslim.
Mser is spoken in Cameroon, Chad, Africa.