Cassilis may refer to:
- Cassilis, New Brunswick, a rural community in Northumberland County, New Brunswick, Canada
- Cassilis, New South Wales, a town in central-western New South Wales, Australia
- Cassilis, Victoria, a town in Gippsland, Victoria, Australia
See also
edit- Cassils (disambiguation)
- Earl of Cassilis, Scottish title (1509-1831, now Marquess of Ailsa)