Monsignor Dr. Mariano Soler (born 25 March 1846 in San Carlos - deceased 26 September 1908 in Gibraltar) was a Uruguayan cleric and the first Roman Catholic archbishop of Montevideo, Uruguay.

He was an outstanding intellectual in the area of the scientific and philosophical culture of Uruguay, and a strong defender of the ecclesiastical institutions (i.e., the prerogatives of Roman Catholic church).

Having expressed interest in ecclesiastical instruction in his adolescence, his family allowed him to enter as a pupil of Don's School (headed by Jaime Roldós y Pons) of Montevideo as a seminarian.

He finished his studies in the Pontifical Colegio Pio Latin American of Rome, being ordained priest on December 20, 1872.

Upon returning to Montevideo, he held the positions of Provisor, Prosecutor, the Vicar General of the Diocese and, between 1874 and 1890, the parish priest of the Cord Church.