| Country: | England |
| Coordinates: | 53.7408°N -0.7487°W |
| Official Name: | Bellasize |
| Civil Parish: | Blacktoft |
| Unitary England: | East Riding of Yorkshire |
| Region: | Yorkshire and the Humber |
| Lieutenancy England: | East Riding of Yorkshire |
| Constituency Westminster: | Haltemprice and Howden |
| Post Town: | GOOLE |
| Postcode District: | DN14 |
| Postcode Area: | DN |
| Dial Code: | 01430 |
| Os Grid Reference: | SE821278 |
| London Distance Mi: | 155 |
| London Direction: | S |
Bellasize is a hamlet and former civil parish, now in the parish of Blacktoft, in the East Riding of Yorkshire, England. It is situated approximately 5miles east of the market town of Howden. In 1931 the parish had a population of 122.[1]
The name of the hamlet derives from the French meaning beautiful seat (belle + assis, belasis, belasyse), and has the same derivation as Belsize.[2] [3] Historically in the wapentake and liberty of Howdenshire.[4] Bellasize was formerly a township in the parish of Eastrington,[5] from 1866 Bellasize was a civil parish in its own right, on 1 April 1935 the parish was abolished and merged with Blacktoft, Eastrington and Laxton, part also went to form Gilberdyke.[6]
Fields to the south of the village were used by the Royal Air Force (and the Royal Flying Corps) as RAF Bellasize between 1916 and 1919, and 1939–1945.[7] During the First World War, the site was used by No.s 31 and 76 Squadrons in the Home Defence role. During this period, it was noted that the site was prone to flooding from the nearby River Ouse.[8] [9] It was pressed back into service during the Second World War as a relief landing ground for No. 4 Elementary Flying Training School, who were based at nearby Brough airfield (to the east). The site had a grass runway which extended to .[10] [11]