| Moat Mount Open Space | 94.07 ha | | — |
| St Pancras and Islington Cemetery | 62.93 ha | | — |
| King George's Playing Fields | 35.26 ha | | — |
| West Hendon Playing Fields | 35.08 ha | | — |
| Oak Hill Park Barnet Council | 33.39 ha | | — |
| Darland's Lake Nature Reserve | 33.32 ha | | — |
| Hampstead Heath Extension | 31.14 ha | | — |
| Brook Farm Open Space | 24.71 ha | | — |
| Arrandene Open Space | 24.26 ha | | — |
| Sunnyhill Park Barnet Council | 22.2 ha | | — |
| Copthall Playing Fields | 16.22 ha | | — |
| Edgwarebury Park Barnet Council | 16.14 ha | | — |
| Clitterhouse Playing Fields | 16.02 ha | | — |
| Whitings Hill Open Space | 15.56 ha | | — |
| Mill Hill Park | 15.16 ha | | — |
| Golders Hill Park | 14.5 ha | | — |
| Arkley Open Space | 13.38 ha | | — |
| Montrose Playing Fields | 13.26 ha | | — |
| Hendon Park | 13.08 ha | | — |
| Barnet Playing Fields | 12.23 ha | | — |
| Whetstone Stray | 11.33 ha | | — |
| Watling Park | 10.67 ha | | — |
| Brunswick Park | 10.5 ha | | — |
| Hadley Green | 9.88 ha | | — |
| Oak Hill Wood Nature Reserve | 9.71 ha | | — |
| Lyttelton Playing Fields | 9.56 ha | | — |
| Friary Park | 9.4 ha | | — |
| Windsor Open Space | 7.93 ha | | — |
| Oakdene Park Barnet Council | 7.92 ha | | — |
| Arkley Lane Open Space | 7.63 ha | | — |
| Big Wood | 7.54 ha | | — |
| Totteridge Fields Nature Reserve | 7.4 ha | | — |
| Woodcroft Park | 6.71 ha | | — |
| Friern Park | 6.64 ha | | — |
| Victoria Recreation Ground | 6.38 ha | | — |
| Chase Lodge Playing Field | 6.36 ha | | — |
| Bethune Park | 6.31 ha | | — |
| Byng Road Playing Fields | 6.16 ha | | — |
| Brent Park Barnet Council | 6.15 ha | | — |
| Wyatts Farm Open Space | 5.88 ha | | — |
| New Southgate Recreation Ground | 5.81 ha | | — |
| Copthall South Fields | 5.8 ha | | — |
| Arkley Rise Estate Open Space | 5.6 ha | | — |
| King George V Playing Fields | 5.56 ha | | — |
| Whitings Hill Wood | 5.51 ha | | — |
| Cherry Tree Wood | 5.47 ha | | — |
| Highwood Park | 5.38 ha | | — |
| Silk Stream Park | 5.37 ha | | — |
| Grahame Park Open Space | 4.89 ha | | — |
| Bethune Nature Reserve Barnet Council | 4.82 ha | | — |
| Friern Bridge Open Space Barnet Council | 4.79 ha | | — |
| Stephens House & Grounds | 4.65 ha | | — |
| Monken Hadley Common | 4.62 ha | | — |
| Mill Hill Park | 4.44 ha | | — |
| Rowley Lodge Field | 4.15 ha | | — |
| Stoneyfields Park | 4.08 ha | | — |
| Victoria Park | 4.0 ha | | — |
| Rushgrove Park | 3.97 ha | | — |
| Victoria Park | 3.79 ha | | — |
| East Barnet Old Grammarians Playing Field | 3.64 ha | | — |
| Swan Lane Open Space | 3.59 ha | | — |
| The Mill Field | 3.53 ha | | — |
| Grange Playing Fields | 3.42 ha | | — |
| Lyndhurst Park | 3.3 ha | | — |
| Northway Gardens | 3.02 ha | | — |
| Ridgeway Views Woodland Gardens | 2.98 ha | 🐕 | — |
| Stonegrove Park | 2.96 ha | | — |
| Ludgrove Playing Field | 2.95 ha | | — |
| River Side Walk Barnet Council | 2.95 ha | | — |
| Old Courthouse Recreation Ground | 2.94 ha | | — |
| Bittacy Hill Park | 2.72 ha | | — |
| Childs Hill Park | 2.72 ha | | — |
| Barnet Countryside Centre | 2.62 ha | | — |
| Basing Hill Park | 2.62 ha | | — |
| Brunswick Park | 2.48 ha | | — |
| Halliwick Recreation Ground | 2.37 ha | | — |
| Buttercup Field | 2.35 ha | | — |
| Arkley Lane Pastures | 2.25 ha | | — |
| Claremont Park | 1.92 ha | | — |
| Malcolm Park | 1.74 ha | | — |
| Greenhill Gardens | 1.63 ha | | — |
| Barnet Hill Common | 1.52 ha | | — |
| Finchley Memorial Hospital Communal Space | 1.48 ha | | — |
| Princes Park Barnet Council | 1.42 ha | | — |
| Panoramic Park | 1.3 ha | | — |
| Colindale Park | 1.27 ha | | — |
| Grove Park | 1.21 ha | | — |
| Scratchwood Park | 1.19 ha | | — |
| Little Wood | 1.13 ha | | — |
| Ravenscroft Park | 1.13 ha | | — |
| Long Lane Pasture | 1.09 ha | | — |
| Highlands Gardens | 1.07 ha | | — |
| Woodhouse Open Space Barnet Council | 1.03 ha | | — |
| Exploratory Park Brent Cross Brent Cross Town | 0.61 ha | | — |
| Chiddingfold Barnet Council | 0.45 ha | | — |
| Willifield Green Barnet Council | 0.3 ha | | — |
| Elm Park | 0.24 ha | | — |
| Quiet Garden | 0.18 ha | | — |
| Ossulton Way Open Space Barnet Council | 0.08 ha | | — |
| NGS Gardens | 0.03 ha | | — |