Indult Catholic was a traditionalist Catholic loaded term used in the early 21st century until c. 2007 as a pejorative label applied to conservative Catholics who attended only the licit celebrations of the Tridentine Mass in Latin according to the 1962 edition of the Roman Missal and regulated by the local bishop through an indult that conformed to the 1984 Congregation for Divine Worship and the Discipline of the Sacraments norms in the indult Quattuor abhinc annos.
The Tridentine Mass was the normative usage of the Roman Rite Mass from the time of the Council of Trent until the liturgical reforms of the Second Vatican Council.
When the Mass of Paul VI, the newer usage of the Roman rite of Mass, replaced the Tridentine Mass, the older usage of the Roman rite of Mass, c. 1970, but prior to Quattuor abhinc annos, celebrets were issued by the Holy See to some priests permitting them to licitly celebrate the older usage, but bishops complained about this approach. In 1971 Pope Paul VI permitted, in what is known as the Heenan or the Agatha Christie indult, local bishops in the Catholic Bishops' Conference of England and Wales to permit the occasional celebration of the older usage according to the 1967 modifications to the 1965 edition of the Roman Missal.