| Kenton Recreation Ground | 21.67 ha | | — |
| Canons Park London Borough of Harrow | 18.31 ha | | — |
| Chandos Recreation Ground | 10.85 ha | | — |
| Harrow Recreation Ground | 10.8 ha | | — |
| West Harrow Recreation Ground | 10.68 ha | | — |
| Newton Park West | 9.14 ha | | — |
| Alexandra Park | 8.79 ha | | — |
| Centenary Park | 8.31 ha | | — |
| Byron Recreation Ground | 7.31 ha | | — |
| Pinner Village Gardens | 6.44 ha | | — |
| Harrow Weald Recreation Ground | 6.33 ha | | — |
| Montesole Playing Fields | 6.13 ha | | — |
| Pinner Memorial Park | 5.26 ha | | — |
| Shaftesbury Playing Fields | 4.63 ha | | — |
| Church Fields | 4.16 ha | | — |
| The Grove Open Space London Borough of Harrow | 2.98 ha | | — |
| The Cedars | 2.91 ha | | — |
| Stanmore Marsh North | 2.76 ha | | — |
| Old Lyonian Association Sports Ground Old Lyonian Association | 2.26 ha | | — |
| Priestmead Recreation Ground | 1.62 ha | | — |
| Little Common | 1.56 ha | | — |
| Hatch End Riverside Park | 1.36 ha | | — |
| Lowlands Recreation Ground | 0.97 ha | | — |
| Bernays Gardens | 0.83 ha | | — |
| Rayners Mead | 0.7 ha | | — |
| Stanmore Marsh South | 0.58 ha | | — |
| King George V Memorial Garden | 0.53 ha | | — |
| Anita Dorfman House Garden | 0.18 ha | | — |
| Pears Court Garden | 0.13 ha | | — |
| Sandpiper Community Garden | 0.1 ha | | — |
| Ahimsa Peace Garden | 0.02 ha | | — |