Name Acronym Date Type* Location Association
(*G–Governmental; I–Institutional; Pr–Private; Pu–Public; S–School & U–University)
| Radcliffe Observatory | ROO | 1772-1935 | U | Oxfordshire | Hornsby, Thomas |
| Reade’s Observatory | ReO | 1853-? | Pr | Buckinghamshire | Reade, Joseph Bancroft |
| Reepham School Observatory | RSO | 2000- | S | Norfolk | Reepham High School |
| Richard Lambert Observatory | RLO | 1979-1996 | I | Buckinghamshire | Lambert, Richard |
| Richardson’s Observatory | RiO | 1853-1857 | I | Yorkshire – West Riding | Richardson, William |
| Richmond Observatory | 1768-1840 | see King’s Observatory (KiOR) | |||
| Richmond Observatory | 1842-2012 | see Kew Observatory (KeOR) | |||
| Robert Roberts’s Observatory | RO | 1800-1820s | Pr | Anglesey | Robert Roberts |
| Robert’s Observatory | see Robert’s Crowborough Observatory [ROC] | ||||
| see Roberts’s Maghull Observatory [RMO] | |||||
| see Roberts’s Rockferry Observatory [PRO] | |||||
| Robert’s Crowborough Observatory | ROC | 1890-1904 | Pr | Sussex | Roberts, Isaac |
| Roberts’s Maghull Observatory | RMO | 1882-1890 | Pr | Lancashire | Roberts, Isaac |
| Roberts’s Rockferry Observatory | RRO | 1878-1882 | Pr | Cheshire | Roberts, Isaac |
| Roger Langdon’s Observatory | RLOS | 1874-1909 | Pr | Devon | Langdon, Roger |
| Roseland Observatory | TRO | 2000- | Pr | Cornwall | Sheen, Brian |
| Rosse Observatory | RosO | 1983- | I | Yorkshire – West Riding | West Yorkshire Astronomical Society; |
| Royal Greenwich Observatory | RGO | 1990-1998 | G | Cambridgeshire | Jones, Harold Spencer |
| Royal Greenwich Observatory | RGOH | 1948-1990 | G | Sussex | |
| Royal Hospital School Observatory | RHSOG | 1849-1930s | S | County of London | Royal Hospital School; Lawson, Henry |
| Royal Naval Academy Observatory | NAOP | 1765-c.1830 | S | Hampshire | Bayley, William |
| Royal Observatory, Edinburgh | ROE | 1896 – | G | Midlothian | |
| Royal Observatory, Greenwich | ROGL | 1675-1958 | G | County of London | See RGO |
| Royal Observatory/Royal Observatory Greenwich | ROGN | 1998- | Pu | County of London | |
| Royal Society’s Observatory | RSOL | fl.1815-1820s | I | County of London | Royal Society |
| Russell’s Observatory | ROWL | 1773-1779 | Pr | County of London | Russell, William |
| St Andrew’s Observatory | SAO | 1675-? | U | Fife | Gregory, David |
| St Andrews University Observatory | SAUO | 1939- | U | Fife | |
| St. Johns College Observatory | SJCOC | 1765-1859 | U | Cambridgeshire | Dunthorne, Richard; Ludlam, William; St. Johns College, Cambridge |
| Saunder’s Observatory | SaOC | 1894-1913 | Pr | Berkshire | Wellington College; Saunder, S.A.; |
| Savilian Professor’s House Observatory | SPHO | 1705-1710; 1842-1860 | U | Oxfordshire | Donkin, William |
| Scots House Observatory | see Pattinson’s Observatory [PO] | ||||
| Scottish Dark Sky Park Observatory | SDSPO | 2012 | Pu | Ayrshire | East Ayr Council |
| Scott’s Observatory | FeO | 1900s | Pr | Glamorgan | Scott, William |
| Scriven Bolton Observatory | SBO | 1913-1929 | Pr | Yorkshire – West Riding | Bolton, Thomas Scriven |
| Seething Observatory | SOSN | 1994- | I | Norfolk | Norwich Astronomical Society (NNAS); Reepham High School |
| Sellers’s Observatory | SOMHL | 1930-1932 | Pr | County of London | Sellers, Francis J. |
| Selwyn’s observatory | SeO | 1863-1874 | Pr | Cambridgeshire | Ely Cathedral |
| Sherwood Observatory | SO | 1986- | I | Nottinghamshire | Mansfield & Sutton Astronomical Society (MaSAS) |
| Shirburn Castle Observatory | UOO | 1739-1800s | Pr | Oxfordshire | Parker, George, second earl of Macclesfield |
| Shuckburgh Observatory | ShO | 1791-1804 | Pr | Warwickshire | Shuckburgh-Evelyn, George Augustus William; Royal Observatory, Greenwich |
| Simms’s Carshalton Observatory | SOC | 1851-1860 | Pr | Surrey | Simms, William |
| Sir Patrick Moore Centre | SPMC | 2004- | I | Channel Islands | Jersey Astronomy Club |
| Slatter’s Observatory | SOI | 1850-1861 | Pr | Oxfordshire | Slatter, John |
| Smyth’s Observatory | SOB | 1827-1839 | Pr | Bedfordshire | Smyth, W.H. |
| Snow’s Observatory | SOA | 1834-1854 | Pr | Kent | Snow, Robert |
| Solar Physics Observatory | see Solar Physics Observatory, South Kensington [SPOSK] | ||||
| see Solar Physics Observatory, Cambridge [SPOC] | |||||
| Solar Physics Observatory, Cambridge | SPOC | 1912-1946 | U | Cambridgeshire | Newall, Robert Stirling |
| Solar Physics Observatory, South Kensington | SPOSK | 1879-1913 | G | County of London | Lockyer, Joseph Norman; Board of Education |
| South’s Observatory | See South’s Southwark Observatory [SOSL] | ||||
| See South’s Campden Hill Observatory [SOCHL] | |||||
| South’s Southwark Observatory | SOSL | 1816-1824 | Pr | County of London | South, James |
| South’s Campden Hill Observatory | SOCHL | 1826-1870 | Pr | County of London | South, James |
| Starfield Observatory | see Lassell’s Starfield Observatory [LSO] | ||||
| Steavenson’s Observatory | SONL | 1930-1939 | Pr | County of London | Steavenson, W.H. |
| Stuckey’s Observatory | StOC | 2014- | Pr | Norfolk | Stuckey, Mark |
| Stonyhurst College Observatory | SCO | 1838- | S | Lancashire | Stonyhurst College |
| Swansea Astronomical Society Observatory | SASO | 1954-1976 | I | Glamorgan | Swansea Astronomical Society (SwAS) |
| Swansea Astronomical Society Observatory | SASO1 | 1978-? | I | Glamorgan | Swansea Astronomical Society (SwAS) |
| Swivelton Lane Observatory | SLOH | 1968-1988 | I | Hampshire | Portsmouth Astronomical Group; Hampshire Astronomical Group (HaAG) |