- Is half-Filipino as his mother is from the Philippines. His father is Irish.
- Was a victim of bullying when in high school.
- First picked up a guitar when he was 15.
- Member of the band Metallica since 1983.
- Was earlier associated with the band Exodus which opened for Metallica in 1982 and 1983 .
- Was ranked 11th in Rolling Stone's list of The 100 Greatest Guitarists of All Time and 15th in Joel McIver's list of 100 Greatest Metal Guitarists.
- Is obsessed with horror and has a large collection of horror memorabilia. He has documented it in his coffee table book "Too Much Horror Business—The Kirk Hammett Collection" which he released on 1 October 2012.
- Was the brain behind "Kirk Von Hammett's Fear FestEvil" that was held in February 2014 that featured among other things live music performances and signings.