John G. Nelson (14 May 1928 – 28 February 2003) was an American police officer with the Los Angeles Police Department who is considered to be the founding father of the SWAT (Special Weapons And Tactics) concept.

After the Watts riots of 1965, Sergeant Nelson personally approached LAPD chief William Parker with his proposal for a SWAT unit.

Nelson had served in the United States Marine Corps and based the SWAT concept on the Recon units, believing that a small squad of highly trained police officers armed with special weapons would be more effective in a riotous situation than a massive police response.

Fearing a political backlash, no one on his command staff was willing to volunteer, including Daryl Gates.

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