Eisingrug (meaning: a place where corn was winnowed after husking^[1]) is a rural hamlet near Harlech, Gwynedd, Wales. It is located to the southeast of Porthmadog.

Eisingrug
Pond in Eisingrug
Eisingrug Location within Gwynedd
OS grid reference	SH614344
Community	Talsarnau
Principal area	Gwynedd
Preserved county	Gwynedd
Country	Wales
Sovereign state	United Kingdom
Post town	TALSARNAU
Postcode district	LL47
Dialling code	01766
Police	North Wales
Fire	North Wales
Ambulance	Welsh
UK Parliament	Dwyfor Meirionnydd
Senedd Cymru – Welsh Parliament	Dwyfor Meirionnydd
List of places UK Wales Gwynedd 52°53′20″N 4°03′36″W / 52.889°N 4.060°W / 52.889; -4.060

Formerly at the edge of the parish of Llandecwyn, the hamlet was served by the church of Saint Tecwyn in the hills above Llandecwyn, and a Wesleyan Methodist chapel at the other end of the Bryn Bwbach to Esingrug road. A Methodist missionary visited Eisingrug in December 1845.^[2]

The Cambrian Line railway passes close to the village. The nearest railway station is to the north at Talsarnau.

In the northeast is the 14th century manor house, Maes-y-Neuadd, formerly home of the Wynn family - land owners, Sheriffs of Merioneth, descended from the 13th Century Osbwrn Wyddel - 'Osborn the Irishman' - related to the Oakleys of Tan y Bwlch and the Vaughns of Cors y Gedol.^[3]

To the southwest is The Glyn and Brogyntyn Estate and to the northwest is Black Wood, a conifer plantation on a steep east-facing hillside with alternating rows of 2 separate conifer species.

The area affords good views over northern parts of Cardigan Bay.