Culnady (named after the townland of Culnady) is a small village near Maghera in County Londonderry, Northern Ireland.

The Grillagh River which is the river that flows through the village underneath the Old Culnady Bridge where a large weir has been constructed to dam the Grillagh for hydro energy for the Culnady mill which is nothing more than rubble these days the Grillagh merges with the Knockoneil to form the Clady below Curdian Bridge.

The Knockoneil River is the other local river in the area it comes down from Upperlands under Dunglady Bridge then shortly downstream merges with the Grillagh to form the Clady.

The Clady River is themain river in the area it can be seen below Eden Bridge not far from the village it flows down towards Greenlough then through Clady and flows out into the Lower Bann above Portglenone Culnady lies within In the 2005 Urban Rural Classification, it was classified as a rural ward.

This article related to the geography of County Londonderry, Northern Ireland is a stub.