| 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 | | — |
| Paddington Street Gardens South Westminster City Council | 0.93 ha | | — |
| Gloucester Square | 0.64 ha | | — |
| Bryanston Square | 0.59 ha | | — |
| Cleveland Square | 0.58 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 | | — |
| Italian Gardens The Royal Parks | 0.49 ha | | — |
| Soho Square Gardens City of Westminster | 0.46 ha | | — |
| Tamplin Mews Gardens Westminster City Council | 0.45 ha | | — |
| Montagu Square | 0.44 ha | | — |
| Christchurch Gardens City of Westminster | 0.37 ha | | — |
| Broadley Street Gardens City of Westminister | 0.34 ha | | — |
| Kensington Gardens Square Garden | 0.34 ha | | — |
| Alma Square Garden | 0.29 ha | | — |
| Norfolk Square Garden City of Westminster | 0.27 ha | | — |
| Paddington Street Gardens North Westminster City Council | 0.25 ha | | — |
| Saint Marylebone Parish Church Gardens City of Westminster | 0.23 ha | | — |
| Golden Square Westminster City Council | 0.2 ha | | — |
| St Anne's Churchyard | 0.16 ha | 🐕 | — |
| Gorilla Circus Regents Park Flying Trapeze School Gorilla Circus | 0.15 ha | | — |
| Sutherland South Garden | 0.15 ha | | — |
| Sussex Gardens City of Westminster | 0.13 ha | | — |
| Westbourne Gardens Westminster City Council | 0.11 ha | | — |
| Harrow Road Open Space Westminster City Council | 0.1 ha | | — |
| Roseberry Garden Mandarin Oriental | 0.09 ha | | — |
| Southwood Garden | 0.08 ha | | — |
| Kensington Gardens Square Garden | 0.06 ha | | — |
| Garden of Rest | 0.04 ha | | — |
| Regent's Park Allotment Garden | 0.03 ha | | — |
| The Allotment | 0.03 ha | | — |
| Living Wall The Athenaeum Hotel | — | | — |