Deacon
Dean — see: Vicar forane
Declaration of Nullity — a canonical judicial sentence declaring that the matrimonial covenant was invalid from the beginning due to impediments or defect of consent
Definitor
Diaconate — see: Deacon
Dicastery
Diocesan administrator
Diocesan bishop
Diocesan chancery
Diocesan curia — see: “Curia (Roman Catholic Church)”
Divine Liturgy
Diocesan priest
Diocesan tribunal — see: Tribunal
Discalceation
Dulia — see also: Hyperdulia (below)