Masabi Rural District (Persian: دهستان مصعبي) is in Aysak District[a] of Sarayan County, South Khorasan province, Iran.

[5] At the time of the 2006 National Census, the rural district's population was 2,445 in 852 households.

[7] The 2016 census measured the population of the rural district as 1,682 in 706 households.

The most populous of its 30 villages was Karimu, with 679 people.

This Sarayan County location article is a stub.