| RSPB Brading Marshes | 361.06 ha | | — |
| Ventnor Downs National Trust | 200.61 ha | | — |
| Woodhouse Copse (ex Brocks Copse) | 21.8 ha | | — |
| RSPB Brading Marshes | 20.13 ha | | — |
| Osborne House, Garden and Grounds English Heritage | 18.44 ha | | — |
| Westover Park | 18.28 ha | | — |
| Alverstone Mead Nature Reserve Wight Nature Fund | 17.59 ha | | — |
| HIWWT Arreton Down Hampshire & isle of Wight Wildlife Trust | 16.68 ha | | — |
| Wydcombe Park | 14.97 ha | | — |
| HIWWT Sandown Meadows Hampshire & Isle of Wight Wildlife Trust | 13.23 ha | | — |
| Dodnor Creek Local Nature Reserve Gift To Nature | 12.08 ha | | — |
| Seaclose Park | 11.09 ha | | — |
| HIWWT Knighton Down Hampshire & Isle of Wight Wildlife Trust | 10.31 ha | | — |
| Pig Leg Lane Nature Reserve Gift To Nature | 9.5 ha | | — |
| Northwood Park | 9.4 ha | | — |
| Woodlands Vale | 9.31 ha | | — |
| Newchurch Moors Nature Reserve Hampshire and Isle of Wight Wildlife Trust | 8.74 ha | 🐕 | — |
| Eaglehead & Bloodstone Copses Nature Reserve Hampshire & Isle of Wight Wildlife Trust | 8.55 ha | | — |
| St. Cecilia's Abbey Grounds | 7.95 ha | | — |
| Ventnor Botanic Garden Ventnor Botanic Garden CIC | 6.88 ha | | — |
| Farringford House Gardens | 6.31 ha | | — |
| Lakeside Hotel Grounds | 5.98 ha | | — |
| Los Altos Park | 5.76 ha | | — |
| Big Meade | 4.62 ha | | — |
| Gatcombe Park | 4.44 ha | | — |
| Northwood Recreation Ground | 4.37 ha | | — |
| Puckpool Park IW Council | 4.28 ha | | — |
| Haddon's Pits (NT) National Trust | 4.15 ha | | — |
| Appuldurcombe House Garden | 3.88 ha | | — |
| Nansen Hill Gift To Nature | 3.85 ha | | — |
| Medina Arboretum | 3.83 ha | | — |
| Dodpits House | 3.72 ha | | — |
| Victoria Recreation Ground | 3.71 ha | | — |
| Stroud Recreation Gound | 3.67 ha | | — |
| Sandham Gardens | 3.37 ha | | — |
| Naturezones | 3.26 ha | | — |
| Ventnor Park | 3.23 ha | | — |
| Pidford Manor | 3.14 ha | | — |
| Nunwell House and Garden | 2.6 ha | | — |
| Kingston Manor | 2.58 ha | | — |
| Chawton Field Nature Reserve (No Public Access) | 2.45 ha | | — |
| Rylstone Gardens | 2.26 ha | | — |
| Downside Recreation Ground | 2.24 ha | | — |
| Mottistone Gardens National Trust | 2.21 ha | | — |
| Brighstone Recreation Ground | 2.15 ha | | — |
| Calbourne Village Green | 2.07 ha | | — |
| Sheat Manor | 2.03 ha | | — |
| Lake Cliff Gardens | 1.88 ha | | — |
| Fernhill Gardens | 1.83 ha | | — |
| Colwell Common | 1.74 ha | | — |
| Medina Riverside Park Gift To Nature | 1.74 ha | | — |
| Pan Country Park Gift To Nature | 1.72 ha | | — |
| Carisbrooke Priory Grounds | 1.61 ha | | — |
| Strathwell Park | 1.33 ha | | — |
| Battery Gardens | 1.3 ha | | — |
| Bagwich | 1.24 ha | | — |
| Far East Collection | 1.12 ha | | — |
| Litten Park | 1.12 ha | 🛝 | — |
| Marie Curie Field of Dreams | 0.25 ha | | — |