Gregorio López y Fuentes (November 17 1895-1966) was a Mexican novelist, poet, and journalist, likely best known for his most famous work, Una Carta a Dios (a Letter to God). He was born on a farm called 'El Mamey' in the municipality of Huasteca , in the province of Side Cross in Mexico.

He was 15 years old when the Mexican Revolution began. At the same age he began to write. Understandably, many of his books concern the Revolution.

He later became a teacher of Literature at a school in Mexico City. In 1921, he began writing for the Universal Graph, a newspaper, often using the pseudonym Tulio F. Peseenz.

He wrote many books and stories in his life, on many subjects, but typically he wrote about Mexico, the country and its people. His stories were seen as exciting and humorous and symbolic of Mexico. A realist, many of his works concerned the oppression of Native Americans. He was a contemporary of Mariano Azuela and Martín Luis Guzmán.

He wrote many books including La siringa de cristal (1914), Claros de selva (1921), El vagabundo (1922), El alma del poblacho (1924), Campamento (1931), Tierra (1932), Mi general (1934), El Indio (1935), Arrieros (1937), and Huasteca (1939).

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For the captain who inspired Hemingway's The Old Man and the Sea, see Gregorio Fuentes.