All four Beatles were vegetarian at various times, and the surviving two still are, see the individual pages for further details:

• John Lennon (Beatles, Plastic Ono Band - page includes Yoko Ono) - vegetarian on and off from 1967
  
  
• Paul McCartney - (Beatles, Wings) veg around 1968 then consistently from the late 70s
  
  
• George Harrison - (Beatles, Plastic Ono Band, Traveling Wilburys) veg from 1966 for life
  
  
• Ringo Starr - (Beatles, Plastic Ono Band) veg on and off in the early days, now sticking with it

see also:

• Linda McCartney - (Wings) veg from the late 70s with Paul
• Ornette Coleman (Plastic Ono Band, one track) veg from 1949!
• Bob Dylan (Traveling Wilburys) - reported to be vegetarian at some point, but unconfirmed