Brigadier-General Frederick James Heyworth, CB, DSO (March 1863 – 9 May 1916) was a British Army officer who was killed by a sniper in Belgium during the First World War while in command of the 3rd Guards Brigade.
A colonel in December 1913, he was made a brigadier general two years later in order to command the 3rd Guards Brigade.
| Frederick James Heyworth | |
| Honorific Suffix: | CB, DSO |
| Rank: | Brigadier-General |
| Branch: | British Army |
| Commands: | 3 Guards Brigade |
| Awards: | Distinguished Service Order |
| Allegiance: |  United Kingdom |
| Birth Date: | 25 March 1863 |
| Birth Place: | Clinton, Gloucestershire |
| Death Place: | Western Front |
| Placeofburial: | Belgium, Brandhoek Military Cemetery |