Seguin is a township in central Ontario, Canada, in the District of Parry Sound.

The Township of Seguin was created by Minister's Order, dated May 8, 1997.

Pursuant to this Order, the Township of Seguin became a newly incorporated municipality, effective January 1, 1998.

The Township of Seguin is the most southerly municipality in the District of Parry Sound.

The township includes the communities of Black Road, Brignall, Dockmure, Dock Siding, Falding, Gordon Bay, Haines Lake, Hamer Bay, Hayes Corners, Holmur, Horseshoe Lake, Humphrey, Lake Joseph, Orrville, Otter Lake, Port Cockburn, Rose Point, Rosseau, Rosseau Road, Seguin Falls, South Parry, Stanley House, Swords and Turtle Lake.