Manx Wildlife Trust (MWT) was founded on 6 March 1973 and is the Isle of Man’s leading nature conservation charity.
As of November 2024, MWT manages 30 nature reserves, including the Calf of Man which is managed with and on behalf of Manx National Trust. These reserves total 551.44 ha (1,362.6 acres), or around 1% of the Isle of Man and include:
| Name | Acquired | Area | Notes | |
|---|---|---|---|---|
| Aust | 2016 | 4.20 ha (10.4 acres) | ||
| Ballachrink | 2011 | 10.08 ha (24.9 acres) | Part of the Renscault & Ballachrink Bird Sanctuary | |
| Ballachurry | 2016 | 1.67 ha (4.1 acres) | ||
| Ballamooar Meadow | 1994 | 0.39 ha (0.96 acres) | ||
| Barnell Reservoir | 1974 & 1984 | 1.57 ha (3.9 acres) | Part of the Ballamoar Bird Sanctuary (Patrick) | |
| Billown | 2023 | 1.66 ha (4.1 acres) | Includes Rosehill Quarry ASSI | |
| Breagle Glen and Cronk Aash | 1988, 1991 & 2010 | 0.85 ha (2.1 acres) | ||
| Calf of Man | 262.34 ha (648.3 acres) | Owned by Manx National Trust, co-managed by Manx Wildlife Trust since 2005. Candidate Ramsar site | ||
| Close e Quayle | 1994 & 2003 | 3.98 ha (9.8 acres) | ||
| Close Sartfield | 1987 | 12.34 ha (30.5 acres) | Part of the Ballaugh Curraghs ASSI and Ramsar Site | |
| Close Umpson | 1995 | 0.66 ha (1.6 acres) | Part of the Ballaugh Curraghs ASSI and Ramsar Site | |
| Cooildarry | 1976 & 1979 | 6.17 ha (15.2 acres) | ||
| Creg y Cowin | 2023 | 43.25 ha (106.9 acres) | ||
| Cronk y Bing | 1989 | 7.23 ha (17.9 acres) | An Area of Special Scientific Interest | |
| Curragh Feeagh | 1986 | 2.39 ha (5.9 acres) | ||
| Curragh Kiondroghad (Onchan Community Wetlands) | 1988 & 1990 | 0.49 ha (1.2 acres) | ||
| Dalby Mountain | 1995 & 2024 | 45.24 ha (111.8 acres) | Candidate Ramsar site | |
| Dalby Mountain Fields | 1995 | 4.26 ha (10.5 acres) | ||
| Dobbie's Meadow | 2013 | 4.08 ha (10.1 acres) | ||
| Earystane | 1998 | 0.72 ha (1.8 acres) | ||
| Fell's Field | 1998 | 1.16 ha (2.9 acres) | ||
| Glen Dhoo | 1995 | 9.62 ha (23.8 acres) | ||
| Glion Darragh | 2024 | 70.34 ha (173.8 acres) | ||
| Goshen | 1995, 1998, 2008 & 2023 | 18.92 ha (46.8 acres) | Part of Ballaugh Curraghs ASSI and Ramsar Site | |
| Hairpin Woodland Park | & 2024| 25.54 ha (63.1 acres) | |||
| Lough Cranstal | 1989 & 2022 | 6.70 ha (16.6 acres) | Candidate Ramsar site | |
| Lough Gat e Whing | 2016 | 1.75 ha (4.3 acres) | ||
| Miss Guyler's Meadow | 1989 | 1.23 ha (3.0 acres) | ||
| Moaney & Crawyn's Meadows | 1995 | 0.96 ha (2.4 acres) | Part of the Ballaugh Curraghs ASSI and Ramsar Site | |
| Mullen e Cloie | 2008 | 1.14 ha (2.8 acres) | ||
| Total | 533.96 ha (1,319.4 acres) | This represents approximately 1% of the Isle of Man's land area (57,198ha) |