The following table chronologically lists Ph.D. degrees conferred from 1915 to 1950. Asterisks (**) after the dissertation title indicate that a copy is on file in the Departmental Library, 5125 Dwinelle.
For degrees granted after 1950, pages are available here:
| YEAR | NAME | DISSERTATION TITLE | DIRECTOR |
| 1915 | Rose, Robert Selden | Quevedo and El Buscón | Schevill |
| 1919 | Spencer, Forrest Eugene | Luis Vélez de Guevara: A Study in His Life and Dramatic Art | Schevill |
| 1925 | Cornish, Beatrice Quijada | Francisco Navarro Villoslada (6 vols.) | Schevill |
| 1925 | Spaulding, Robert Kilburn | A Study of the History and Syntax of the Progressive Construction in Spanish | Hills |
| 1927 | Kincaid, William Abraham | The Life and Works of Luis de Belmonte Bermúdez | Morley |
| 1928 | Marsh, George Bonner | A Diplomatic Edition of the Arcipreste de Talavera with an Introduction | Schevill |
| 1928 | Wright, Leavitt Olds | A Study of the History of the -ra Verb Form in Spanish | Hills |
| 1930 | Corbató, Hermenegildo | Los misterios del Corpus de Valencia; Edición diplomática, notas y estudio | Morley |
| 1930 | Grismer, Raymond Leonard | The Influence of Titus Maccius Plautus on the Spanish Theater through Juan de Timoneda | Schevill |
| 1932 | Eyring, Edward | The Use of the Accusative a in Certain Old Spanish Documents | Schevill |
| 1933 | Sánchez y Escribano, Federico | Apuntes para una edición de la Philosophia Vulgar de Juan de Mal Lara | Schevill |
| 1934 | Elsdon, James Harold | Aspects of a Study of the Life and Works of Antonio de Torquemada | Schevill |
| 1934 | Clarke, Dorothy Clotelle | Diversas Rimas de Vicente Espinel, Edición crítica con un estudio del desarrollo de la décima | Morley |
| 1934 | Gabbert, Thomas Arthur | The Dramas of Dumas Père in Spain (1834-1850): A Bibliographical Study | Morley |
| 1935 | Bickley, James Graham | The Life and Works of Rafael Delgado | Torres-Rioseco |
| 1935 | Lopes, Albert Richard | Aspects of the Language of the Realistic Novel of the Seventeenth Century | Schevill |
| 1935 | Warner, Ralph Emerson | The Life and Works of Ignacio Manuel Altamirano | Torres-Rioseco |
| 1936 | Kirschenbaum, Leo | Enrique Gaspar and the Social Drama in Spain | Morley |
| 1936 | Morby, Edwin Seth | The Plays of Juan de la Cueva | Schevill |
| 1936 | Shone, Alice Irwin | Amado Nervo: A Mexican Modernista in the Baudelairian Manner | Torres-Rioseco |
| 1937 | Berrien, William Joseph | Rodó: Biografía y estudio crítico | Torres-Rioseco |
| 1940 | Fallis, Charles George | A Critical Edition of Selected Poems of D. Jerónimo de Barrionuevo | Morley |
| 1940 | Luna, José Luis | La Influencia de París en la evolución literaria de Enrique Gómez Carrillo y otros escritores hispano-americanos, 1890-1914 | Torres-Rioseco |
| 1942 | Fränkel, Hans Herman | Figurative Language in the serious Poetry of Quevedo: A Contribution to the Study of Conceptismo | Buceta |
| 1943 | Crowley, Cornelius | Costumbrismo in Chilean Literary Prose of the Nineteenth Century | Torres-Rioseco |
| 1943 | Terán, Carlos Manuel | Regimio Crespo Toral: El hombre, su vida y su obra | Torres-Rioseco |
| 1947 | Alegría, Fernando | La poesía chilena: Investigación de sus orígenes y desarrollo desde el siglo XVI al siglo XIX | Torres-Rioseco |
| 1948 | House, Ruth DeMar | A Study of Formulas and Repetition in the Spanish Ballad | Morley |
| 1949 | Schevill, Karl Edwin | The Moral and Didactic Prose Works of Diego de Torres y Villarroel (1696-1770) | Simpson |
| 1949 | Webber, Erwin Jack | Origins of the Spanish Theater as Related to the Classical Latin Drama | Morley |