The Edificio José de Diego (English: José de Diego Building) in Mayagüez, Puerto Rico, also known as the Rectoría, is a historic building on the grounds of the University of Puerto Rico at Mayagüez.

It was slightly affected by the 1918 San Fermín earthquake, it housed the administrative offices, the library and nine class rooms.

[3] Follow the steps of the central staircase regular service, stand two columns - "dístilo" smooth shaft and reduced éntasis, with its pedestal, “basa”, toscano-romano capital marked “astragalo”.

On the two abacus terminals holds a short frieze with the inscription in English the name of the school.

[3] In the middle section rises the Tower surrounded by balustrades and four campaniformes floreados pinnacles below of the cantilever roof supported by plates; inside lies the "Carillon" service, with external exits to their respective clocks.