The actor, who played the popular soap character Frank Butcher, died from a sudden heart attack in Spain last month.
Fellow EastEnders cast members including Pam St Clement, Barbara Windsor, June Brown and Sid Owen are reportedly among the 150 mourners expected at the church service.
Other celebrities that are planning to attend include the comedians Frank Carson and Russ Abbott.
Reid's agent David Hahn spoke of his amazement at the reaction to the star's death. He commented: "Mike was a people's person. He loved the working man in the street. Mike always said to me, 'it's those people who put me where I am today'. I knew Mike was a popular man but I never in a million years expected him to be as popular as this."
The agent revealed that he had received over 2,000 emails offering condolences for the TV star's death.