Murray is a two-time Olympic champion in the singles, winning his first Games gold at Wimbledon at London 2012 and successfully defending that title in Rio de Janeiro four years later.
The 34-year-old is not expected to be among the medal contenders in the singles in Tokyo in the wake of his injury problems.
But having already won a doubles title since his return – back at Queen’s Club in 2019 – his medal chances could prove more realistic in the men’s doubles.
He said: “The Olympics mean a huge amount to me, it’s a massive honour to be able to compete at a fourth Games.
“Leading Team GB out at the opening ceremony five years ago in Rio was one of the highlights of my career. Going to a second Olympics as defending champion is exciting and I’m looking forward to the challenge.”
The women’s singles berths have gone to Johanna Konta and Heather Watson, who are also paired together in the doubles. In addition, a second men’s doubles pair of Dan Evans and Neal Skupski have also been selected.
Murray’s doubles specialist brother Jamie was noticeably absent from the team, while British No2 Cameron Norrie, who will be seeded at Wimbledon next week, had previously raised doubts about playing at the Games.