Seyyed Mahalleh (Persian: سيدمحله)[a] is a village in, and the capital of, Langarud-e Sharqi Rural District[4][b] of the Central District of Abbasabad County, Mazandaran province, Iran.

At the time of the 2006 National Census, the village's population was 782 in 224 households, when it was in Langarud Rural District[c] of the former Abbasabad District of Tonekabon County.

[6] The following census in 2011 counted 951 people in 298 households,[7] by which time the district had been separated from the county in the establishment of Abbasabad County.

The rural district was transferred to the new Central District and its name changed to Langarud-e Sharqi Rural District.

This Abbasabad County location article is a stub.