Mas-ha (Arabic: مسحة) is a Palestinian village in the Salfit Governorate in the northern West Bank, 24 kilometers southwest of Nablus.

It is bordered by Biddya to the east, Az Zawiya to the south, Azzun Atma to the west, and Sanniriya and Beit Amin to the north.

Situated between Dayr Ghassāna in the south and the present Route 5 in the north, and between Majdal Yābā in the west and Jammā‘īn, Mardā and Kifl Ḥāris in the east, this area served, according to historian Roy Marom, "as a buffer zone between the political-economic-social units of the Jerusalem and the Nablus regions.

On the political level, it suffered from instability due to the migration of the Bedouin tribes and the constant competition among local clans for the right to collect taxes on behalf of the Ottoman authorities.

[9] In 1882 the PEF's Survey of Western Palestine (SWP) described Mes-ha as "a good-sized village, with a high central house, but partly ruinous.