The Midnight Mass of Christmas in 1943 from the then Cathedral of Saint Vibiana, Los Angeles was included in the film Christmas Holiday starring Deanna Durbin and Gene Kelly, released in 1944.
Because there is no studio lighting, the sequence is really dark, but they filmed the actual mass.
What is the oldest recorded filmed Catholic mass?
The first complete televised Catholic Mass was on Christmas Eve 1948.
Andrew Leach’s answer puts forth a earlier date of 1943, which in a sense is true, but it is not of a complete Catholic Mass and is simply part of the movie: Christmas Holiday! If the Mass within the Christmas Holiday has the act of ...