A Blue Mass is a Mass celebrated annually throughout the United States[1] in the Catholic Church for those employed in the "public safety field" (i.e. police officers, firefighters, correctional officers, 911 operators and EMS personnel).

[3] Similar to the Red Mass, the service honors those who have died in the line of duty and those currently serving as first responders.

[5][6] Though usually held in a Catholic church, non-Catholics are generally invited to attend.

Thomas Dade started the service as part of his duties with the Catholic Police and Fireman’s Society.

[9] The first Mass was held at St. Patrick’s Catholic Church in Washington, D.C., and has grown to a nationwide celebration.