Thomas Joseph Mardaga (May 14, 1913 – May 28, 1984) was an American prelate of the Roman Catholic Church.

[1] He attended St. Charles College in Catonsville, Maryland before studying for the priesthood at St. Mary's Seminary in Baltimore.

[3] Mardaga then served as a curate at St. Paul Parish in Baltimore until being transferred to the Basilica of the Assumption, where he later became rector.

[2] In addition to his pastoral work, he served as archdiocesan director of the Catholic Youth Organization and the Confraternity of Christian Doctrine, executive secretary of the Catholic Charities Fund, and a member of the archdiocesan board of consultors.

[3] He received his episcopal consecration on January 25, 1967, from Cardinal Lawrence Shehan, with Bishops John Russell and Thomas Murphy serving as co-consecrators, at the Cathedral of Mary Our Queen in Baltimore.