The prayer asks God to stop the hands of the terrorists hurting other people and for him to send a spirit of peace.
The Pakistan Catholic Bishops' Conference also condemned the bombing, saying that the "killing innocent people is (an) inhuman act and totally unacceptable."
The Taliban Islamist extremist group has claimed responsibility for the blast which happened in the south-western city of Quetta, injuring 120 others.
Lawyers protest after the killing of yet another legal professional
Mourners grieve for victims of the blast
It happened as mourners were accompanying the body of Bilal Anwar Kasi, the late president of the Balochistan Bar Association, to the hospital after he was shot dead earlier that day.
Bilal Anwar Kasi was killed after speaking out against the assassination of other legal professionals by terrorists, closing the local courts in protest.
Several lawyers and journalists, some of whom protested alongside Mr Kasi at the targeting killings of other legal professionals, were among the dead after the blast.
The Church of England tweeted:
A prayer for #Quetta, Pakistan https://t.co/uPu4BuLNtR pic.twitter.com/GOgfww98SZ
— Church of England (@c_of_e) August 8, 2016
Pakistan Prime Minister Nawaz Sharif (below) condemned the attacks and expressed his grief in response to them.
Pakistani Prime Minister Nawaz Sharif visiting a victim in hospital
He said: "No-one will be allowed to disturb the peace of the province.
The people, policy and security forces in Balochistan have given sacrifices for the country."
The Pakistan Catholic Bishop's Conference said: "The commission and the Catholic Church stand firmly with the people of Balochistan in this hour."
It also urged the Pakistani government "to bring the perpetrators of this heinous crime to justice."
