The one-off programme will look back at the career of the actor and director, who died aged 90 on Sunday (August 24).
Steven Spielberg, Sir Anthony Hopkins, Penelope Wilton, Hayley Mills and Sir Kenneth Branagh will be among the friends and colleagues who will reflect on their memories of working with Attenborough.
Former Prime Minister Gordon Brown, broadcaster Melvyn Bragg and former Channel 4 Chief Executive Michael Grade will also appear.
The special will also include archive material from many of Attenborough's films, including Brighton Rock, 10 Rillington Place and Gandhi.
Channel 4's Chief Executive David Abraham said: "As well as being one of Britain's finest actors and directors, he was also one of the founding fathers of Channel 4.
"He was Deputy Chairman from 1982 to 1987, having turned down the Chairmanship as he was busy making Ghandi. He was then