Cashel, Ontario is a small hamlet situated in Unionville, Ontario located at the intersection of Elgin Mills Road and York Regional Road 67.

The name was changed to Cashel in 1851 with the opening of its first post office (located at southwest corner of Major Mackenzie and McCowan Road - now farmland).

[2] The church is a historic site and not operating since the 1960s to 1970s, but cemetery remains in active use.

There are few dwellings located at the site, most of them near York Regional Road 3, the western boundary of this community.

[3] The only reminder of Cashel is the Asa Henry Summerfeldt's 1860s British American Inn but built around 1851 by Robert McCormick opened by, now a private residence and before as Roadside Antiques.