Security Forces Headquarters – Jaffna (SFHQ-J) is a regional command of the Sri Lanka Army, that is responsible for the operational deployment and command all army units stationed in and around the Jaffna Peninsula in the Northern Province.

At the height of the Sri Lankan Civil War, SFHQ-J included several divisions and the independent brigades.

The first permanent formation to be established in the Jaffna Peninsula since Ceylon gained its independence from the British in 1948 was the headquarters established by the Ceylon Army for "Operations Monty" in 1952 to stop illegal immigration of Indian Tamils.

In 1963, "Operations Monty" was renamed Task Force Anti Illicit Immigration (TFAII), expanding its role in supporting the Royal Ceylon Navy coastal patrols and Ceylon Police Force operations in the Northern Province to intercept illicit immigration and smuggling.

Following failed peace talks in 1994, and increased military operations in the Jaffna Peninsula, 21 Brigade was renamed Task Force 1.