Books of condolence were opened at churches across the West Midlands and special services held last night for the bombings' victims.
Religious leaders across the region united in their condemnation of the attacks.
The Archbishop of Birmingham, the Most Rev Vincent Nichols, described the terrorist attacks as "outrageous".
"For many years, while a bishop in north London, I too travelled every day on these tubes and share the deep sense of shock and revulsion of what has happened," he said.
Canon Gary O'Neill, from Birmingham Cathedral, said a book of condolence had been opened for those caught up in the blast. He also led the 6pm service yesterday in which prayers were said for the injured and bereaved.
Mohan Singh, president of the gurdwaras in South Birmingham, said: "The whole of the Sikh community is horrified that this has happened."
The chair of Birmingham's Jewish community, Ruth Jacobs, said: "The Jewish community feels very sad at this tragic loss of life. The victims and their families will be remembered during services."
In a joint statement, Birmingham's civic and faith leaders condemned the bombings. "We are also united in our condemnation of this outrageous act of terrorism. Attacks like this are targeted at the defenceless," it said.