| Hyde Park The Royal Parks | 138.97 ha | | — |
| The Regent's Park The Royal Parks | 117.55 ha | | — |
| Kensington Gardens The Royal Parks | 110.07 ha | | — |
| St. James's Park The Royal Parks | 23.0 ha | | — |
| The Green Park The Royal Parks | 20.27 ha | | — |
| Buckingham Palace Garden | 18.05 ha | | — |
| Paddington Recreation Ground | 10.72 ha | | — |
| Queen Mary's Gardens | 5.85 ha | | — |
| Westbourne Green Open Space | 3.57 ha | | — |
| Eaton Square Garden | 2.54 ha | | — |
| Park Square Gardens | 2.22 ha | | — |
| Avenue Gardens | 2.18 ha | | — |
| Victoria Embankment Gardens City of Westminster | 2.07 ha | | — |
| Victoria Tower Gardens The Royal Parks | 2.01 ha | | — |
| St. John's Wood Church Grounds City Of Westminster | 1.96 ha | | — |
| Belgrave Square | 1.87 ha | | — |
| Grosvenor Square The Royal Parks | 1.76 ha | | — |
| Crescent Garden | 1.47 ha | | — |
| The Rose Garden | 1.46 ha | 🐕 | — |
| St Mary's Churchyard | 1.41 ha | | — |
| St. George's Square City of Westminster | 1.24 ha | | — |
| Queen's Park Gardens | 1.23 ha | | — |
| Formosa Garden | 1.09 ha | | — |
| Prince's Gardens Imperial College London | 1.09 ha | | — |
| Portman Square Garden | 1.08 ha | | — |
| Berkeley Square | 1.04 ha | | — |
| Prince's Gate Garden Imperial College | 1.04 ha | | — |
| Winter Gardens | 1.03 ha | | — |
| Park Crescent Gardens | 0.99 ha | | — |
| Eccleston Square | 0.96 ha | | — |
| Paddington Street Gardens South Westminster City Council | 0.93 ha | | — |
| Hyde Park Gardens | 0.88 ha | | — |
| Warwick Square | 0.85 ha | | — |
| Whitehall Garden | 0.84 ha | | — |
| St James's Square Gardens | 0.83 ha | | — |
| The Dell | 0.78 ha | | — |
| Cavendish Square | 0.65 ha | | — |
| Gloucester Square | 0.64 ha | | — |
| Whitehall Garden | 0.64 ha | | — |
| Bryanston Square | 0.59 ha | | — |
| Cleveland Square | 0.58 ha | | — |
| College Garden | 0.56 ha | | — |
| Forty Tree Green | 0.56 ha | | — |
| Mount Street Gardens City of Westminster | 0.56 ha | | — |
| St John's Lodge Gardens Royal Parks | 0.53 ha | | — |
| Bessborough Gardens | 0.51 ha | | — |
| St John's Gardens | 0.51 ha | | — |
| Paddington Green | 0.5 ha | | — |
| Italian Gardens The Royal Parks | 0.49 ha | | — |
| Little Venice Gardens | 0.47 ha | | — |
| Soho Square Gardens City of Westminster | 0.46 ha | | — |
| Ennismore Gardens | 0.45 ha | | — |
| Tamplin Mews Gardens Westminster City Council | 0.45 ha | | — |
| Montagu Square | 0.44 ha | | — |
| Pimlico Gardens | 0.42 ha | 🐕 | — |
| Dean's Yard | 0.39 ha | | — |
| Hyde Park Square | 0.39 ha | | — |
| Waterloo Place West Garden | 0.39 ha | | — |
| Triangle Garden | 0.38 ha | | — |
| Christchurch Gardens City of Westminster | 0.37 ha | | — |
| Leicester Square | 0.37 ha | | — |
| Leinster Square Gardens | 0.37 ha | | — |
| Porchester Square | 0.37 ha | | — |
| Dorset Square | 0.35 ha | | — |
| Prince's Square Gardens | 0.35 ha | | — |
| Broadley Street Gardens City of Westminister | 0.34 ha | | — |
| Kensington Gardens Square Garden | 0.34 ha | | — |
| Rembrandt Gardens | 0.34 ha | | — |
| Sussex Square Gardens | 0.33 ha | | — |
| College Green | 0.32 ha | | — |
| Tresham Gardens | 0.32 ha | | — |
| Connaught Square | 0.3 ha | | — |
| Ebury Square Gardens | 0.3 ha | | — |
| Alma Square Garden | 0.29 ha | | — |
| Edbrooke Road Gardens | 0.29 ha | | — |
| Manchester Square | 0.29 ha | | — |
| Hanover Square | 0.28 ha | | — |
| Hyde Park Enclosed Garden | 0.27 ha | | — |
| Norfolk Square Garden City of Westminster | 0.27 ha | | — |
| Victoria Border | 0.27 ha | | — |
| Victoria Embankment Gardens | 0.27 ha | | — |
| Norfolk Crescent Garden | 0.26 ha | | — |
| Black Rod's Garden | 0.25 ha | | — |
| Paddington Street Gardens North Westminster City Council | 0.25 ha | | — |
| Chester Square Gardens south | 0.24 ha | | — |
| Grosvenor Gardens | 0.24 ha | | — |
| Millbank Gardens | 0.24 ha | | — |
| Quiet Gardens | 0.24 ha | | — |
| Saint Marylebone Parish Church Gardens City of Westminster | 0.23 ha | | — |
| Violet Hill Park | 0.23 ha | | — |
| Waterloo Place East Garden | 0.23 ha | | — |
| Inigo Jones Garden | 0.22 ha | | — |
| Bird breeding area | 0.21 ha | | — |
| Green Street Garden | 0.21 ha | | — |
| Grosvenor Gardens | 0.21 ha | | — |
| The Rose Garden | 0.21 ha | | — |
| Golden Square Westminster City Council | 0.2 ha | | — |
| Shrewsbury Gardens | 0.2 ha | | — |
| Mountbatten Copse | 0.19 ha | | — |
| Pearson Square | 0.19 ha | | — |
| The Rose Garden | 0.19 ha | | — |
| Montpelier Square | 0.18 ha | | — |
| Victoria Tower Gardens South | 0.18 ha | | — |
| Mountbatten Green | 0.17 ha | | — |
| Channel 4 Park | 0.16 ha | | — |
| Hyde Park Gardens | 0.16 ha | | — |
| Queen's Gardens | 0.16 ha | | — |
| St Anne's Churchyard | 0.16 ha | 🐕 | — |
| Woolhouse Garden | 0.16 ha | | — |
| Chesham Place | 0.15 ha | | — |
| Coronation Garden | 0.15 ha | | — |
| Gorilla Circus Regents Park Flying Trapeze School Gorilla Circus | 0.15 ha | | — |
| Queen's Park Court Communal Gardens | 0.15 ha | | — |
| Rutland Gate South Garden | 0.15 ha | | — |
| Sutherland South Garden | 0.15 ha | | — |
| Chester Square Gardens north | 0.14 ha | | — |
| Riverside Walk Gardens | 0.13 ha | | — |
| Sussex Gardens City of Westminster | 0.13 ha | | — |
| The Goring Hotel Gardens | 0.13 ha | | — |
| Kingdom Square | 0.12 ha | | — |
| Mulberry Square | 0.12 ha | | — |
| Rutland Gate Upper Garden | 0.12 ha | | — |
| St Stephen's Gardens | 0.12 ha | | — |
| Causton Street Playground | 0.11 ha | | — |
| Churchill Gardens Wildflower Garden | 0.11 ha | | — |
| Corringham Garden | 0.11 ha | | — |
| Rose Garden | 0.11 ha | | — |
| Speaker's Green | 0.11 ha | | — |
| Trevor Square | 0.11 ha | | — |
| Westbourne Gardens Westminster City Council | 0.11 ha | | — |
| "Berlin Wall" | 0.1 ha | | — |
| Cardinal Place Roof Gaeden | 0.1 ha | | — |
| Harrow Road Open Space Westminster City Council | 0.1 ha | | — |
| Orange Park | 0.1 ha | | — |
| Saint Mary's Square | 0.1 ha | | — |
| Talbot Square Gardens | 0.1 ha | | — |
| Cleveland Gardens | 0.09 ha | | — |
| Cromwell Green | 0.09 ha | | — |
| Roseberry Garden Mandarin Oriental | 0.09 ha | | — |
| Secret Garden | 0.08 ha | | — |
| Southwood Garden | 0.08 ha | | — |
| Cloister Garth | 0.07 ha | | — |
| Harris Garden | 0.07 ha | | — |
| Floating Pocket Park | 0.06 ha | | — |
| Japanese Garden | 0.06 ha | | — |
| Kensington Gardens Square Garden | 0.06 ha | | — |
| Kildare Gardens | 0.05 ha | | — |
| Bloomfield Garden | 0.04 ha | | — |
| Garden of Rest | 0.04 ha | | — |
| Bird Sanctuary | 0.03 ha | | — |
| Regent's Park Allotment Garden | 0.03 ha | | — |
| The Allotment | 0.03 ha | | — |
| Victoria Square | 0.03 ha | | — |
| Wildlife Garden | 0.03 ha | | — |
| Flanders Fields Memorial Garden | 0.02 ha | | — |
| Dove Place | 0.01 ha | | — |
| Little Cloister Garden | 0.01 ha | | — |
| St Catherine's Garden | 0.01 ha | | — |
| Living Wall The Athenaeum Hotel | — | | — |
| Nannies' Lawn | — | | — |
| Onion Garden | — | | — |
| The Cockpit | — | | — |
| The Meadow | — | | — |
| The Parade Ground | — | | — |