The Catholic Archdiocese of Boston, in response to criticism it was sanctioning a celebration of Gay Pride month, announced yesterday that it had ordered a South End church to cancel a Mass scheduled for next weekend that was themed, “All are Welcome.’’

The decision outraged members of the lesbian and gay community.

“I think that’s horrible, just horrible, that they would cancel,’’ said Marianne Duddy-Burke, executive director of DignityUSA, an organization that advocates for participation of gays in the Catholic Church. “What an abuse of authority. I wish I could be surprised, but I’m definitely appalled.’’

In its most recent bulletin, St. Cecilia Parish said that it had planned a “liturgy to commemorate Boston Pride 2011’’ for later this month.

“The Rainbow Ministry of St. Cecilia Parish invites all friends and supporters of the LGBT community to a Mass in celebration of Boston’s Pride Month,’’ the bulletin said. “The theme of the liturgy, ‘All Are Welcome,’ honors Christ’s message of hope and salvation to all people. We will also celebrate the diverse community that finds its home at St. Cecilia.’’

But after protests from conservative church members, the archdiocese intervened.

“The wording and placement of a bulletin notice announcing that the St. Cecilia Rainbow Ministry will be joining the parish at a Mass on June 19 may have given the unintended impression that the Mass is in support of Gay Pride Week; it is not,’’ said Terrence C. Donilon, a spokesman for the archdiocese. “The pastor will clarify this issue at the Masses this coming weekend.’’

The pastor of the church, the Rev. John J. Unni, did not return calls. Donilon said that he spoke for the parish and that the decision was made by senior officials at the archdiocese.

Donilon declined to answer questions about the apparent contradiction of the church’s bulletin and his statement. He said, however, that there would be a Mass in the future to welcome the community, but not specifically gays and lesbians.

Burke of DignityUSA called on the parish community to “resist the calls for canceling’’ and possibly move the event to a different location. “What kind of message does this send to the gays and lesbians in that parish?’’ she asked.

Susan Donnelly, a member of the parish council of St. Cecilia Parish, said the scheduled Mass had not sparked controversy at St. Cecilia’s. She said the criticism has come from outside.