Pedro Castellanos Lambley (1902–1961) was a Mexican priest and architect, who gained renown in the state of Jalisco during a time of early Modernism marked by sacred purity.

While developing in the field of architecture, Catellanos continued his religious vocation, joining the convent of Franciscan friars in Aguascalientes, in 1938.

He built a series of religious buildings around the state, including the Main Seminary, the chapel at Ciudad Granja, and the churches of Solitude, Holy Cross, and the Sacred Heart, as well as others in small towns.

In general, one must also highlight his residential compounds, which combine the local tradition of the patio, while allotting great individuality to each unit.

At his death in 1961, the College of Architects honored him with a post-mortem honoris causa distinction, for a life devoted to the production of architecture.