Muaither (Arabic: معيذر, romanized: Mu'aīdhir) is a district of Al Rayyan City in Qatar, located in the municipality of Al Rayyan.

[3][4] Referencing the area's geography, 'muaither' is derived from the Arabic 'mathar', meaning "place where animals are kept".

Muaither is situated in a rawda (depression), meaning that water runoff accumulates in it, leading to increased plant activity.

[5] When free elections of the Central Municipal Council first took place in Qatar during 1999,[6] Muaither was designated the seat of constituency no.

[12] Al-Hekma Medical Complex, a health care facility, is located in Muaither.