Sagarmāthā Zone was one of the fourteen zones of Nepal until the restructuring of zones into provinces. The headquarters of Sagarmatha is Rajbiraj. Sagarmāthā is a Nepali word which as per some sources, is derived from सगर and माथा.

Okhaldhunga is the headquarters of the Okhaldhunga District in the Sagarmatha Zone of Nepal. At the time of the 1991 Nepal census it had a population of 3761 living in 790 individual households.