Ferns can refer to:
- Fern, any of many groups of Pteridophyta in the plant kingdom
- Ferns, County Wexford, a small historic town in north County Wexford, Ireland
- The Roman Catholic Diocese of Ferns
- The Bishop of Ferns and Leighlin (Church of Ireland)
- The Bishop of Ossory, Ferns and Leighlin (Church of Ireland)
- Ferns Inquiry, an Irish government inquiry into allegations of clerical sexual abuse in the Irish Catholic Diocese of Ferns