Nathaniel Fiennes, 21st Baron Saye and Sele
| The Lord Saye and Sele | |
|---|---|
| Personal details | |
| Born | Nathaniel Thomas Allen Twisleton-Wykeham-Fiennes 22 September 1920 | 
| Died | 20 January 2024 (aged 103) | 
| Nationality | British | 
| Spouse | Mariette Salisbury-Jones  (m. 1958) | 
| Children | 5, including Susannah and William | 
| Parent | |
| Military career | |
| Allegiance | United Kingdom | 
| Service | British Army | 
| Years of service | 1941–1950 | 
| Rank | Major | 
| Unit | Rifle Brigade | 
| Battles / wars | |
| Awards | Mentioned in despatches (2) | 
Nathaniel Thomas Allen Fiennes, 21st Baron Saye and Sele, DL (né Twisleton-Wykeham-Fiennes; 22 September 1920 – 20 January 2024), styled as Lord Saye and Sele, was an English peer, businessman, chartered surveyor and army officer.