László Bánffy de Losoncz was born 11 September 1896 in Gheja, Mureș County, Romania to János Bánffy de Losoncz (1870-1946) and Róza Ugron de Ábránfalva (1874-1953) and died 16 December 1974 Cluj-Napoca, Cluj County, Romania of unspecified causes. He married Ilona Zeyk de Zeykfalva (1909-c1985) 26 June 1932 in Cluj-Napoca, Cluj County, Romania.
Children
| Name | Birth | Death | Joined with |
| János Bánffy de Losoncz (1934-c2000) | 10 October 1934 Cluj-Napoca, Cluj County, Romania | Margit Körmendy (1937) Erzsébet Jósika de Branyicska (1949) | |
| Éva Mária Bánffy de Losoncz (1943-2009) | 19 January 1943 Cluj-Napoca, Cluj County, Romania | 5 July 2009 Cluj-Napoca, Cluj County, Romania | Csaba Györke (1941) |
Siblings
| Name | Birth | Death | Joined with |
| János Bánffy de Losoncz (1895-1956) | 17 August 1895 Gheja, Mureș County, Romania | 8 March 1956 Cluj-Napoca, Cluj County, Romania | |
| László Bánffy de Losoncz (1896-1974) | 11 September 1896 Gheja, Mureș County, Romania | 16 December 1974 Cluj-Napoca, Cluj County, Romania | Ilona Zeyk de Zeykfalva (1909-c1985) |
| István Bánffy de Losoncz (1898-1944) | 28 December 1898 Gheja, Mureș County, Romania | 30 October 1944 Debrecen, Hajdú-Bihar County, Hungary | Emma Mikes de Zabola (1899-1929) |
Residences
Footnotes (including sources)