Leo Williams, also known as E-zee-kill, is a British bass guitarist.

In 1984 he co-founded Big Audio Dynamite, a band led by Mick Jones, known from The Clash. The original BAD line-up broke up in 1989. Williams later joined Dreadzone with his former band mates Greg Roberts and Dan Donovan.

On March 2007 Leo Williams was announced as a touring bassist for Carbon/Silicon, Mick Jones' new band.