| Country: | England |
| Fullname: | Denis Geoffrey Oswald |
| Birth Date: | 12 November 1910 |
| Birth Place: | Stanley, Falkland Islands |
| Death Place: | Uppingham, Rutland, England |
| Batting: | Right-handed |
| Club1: | Oxford University |
| Year1: | 1931 |
| Club2: | Hertfordshire |
| Year2: | 1931 - 1932 |
| Columns: | 1 |
| Column1: | First-class |
| Matches1: | 2 |
| Runs1: | 21 |
| Bat Avg1: | 21.00 |
| 100S/50S1: | –/– |
| Top Score1: | 16 |
| Hidedeliveries: | true |
| Catches/Stumpings1: | –/– |
| Date: | 7 July |
| Year: | 2019 |
| Source: | http://www.espncricinfo.com/england/content/player/18344.html Cricinfo |
Denis Geoffrey Oswald (12 November 1910 - 5 February 1998) was an English first-class cricketer, educator and a codebreaker at Bletchley Park.
Oswald was born at Stanley in the Falkland Islands to Louis and Lillian Oswald. He left the Falklands for England with his family when he was 8 years old aboard the .[1] He was educated in England at St Lawrence College, Ramsgate, before going up to Wadham College, Oxford.[2] While studying at Oxford, he made two appearances in first-class cricket for Oxford University in 1931, playing against Leicestershire and the touring New Zealanders at Oxford.[3] In addition to playing first-class cricket, Oswald also played minor counties cricket for Hertfordshire in 1931 and 1932, making a total of nine appearances in the Minor Counties Championship.[4] After graduating from Oxford in 1932, Oswald took up the post of languages teacher at Uppingham School.[5]
Oswald served in the Intelligence Corps during the Second World War, initially as a private. He was commissioned as a second lieutenant in June 1941. In Autumn 1942, Oswald, alongside Ralph Tester, Jerry Roberts and Peter Ericsson, founded the Testery section at Bletchley Park.[5]