The singer died from kidney failure last month after suffering from cancer and pneumonia.
A glass-sided carriage, drawn by four horses, will travel through the town at about 1.30pm, followed by a private church service.
Gibb's close friend and radio presenter Henry Wymbs said of Robin: "Part of my youth died with him because he created so many of the songs I loved.
"But I enjoyed meeting him. He was humble, down to earth, a very genuine man who wasn't affected by fame or wealth.
"Apparently he had really become a part of the community in Thame and I can believe that because he was such a nice man."
His son Robin-John said the Bee Gees hit I Started A Joke would be played at the church.
The track Don't Cry Alone, which is one of Gibb's final compositions from his Titanic Requiem - premiered only weeks before his death - will also be played.