Olegario Reyes del Río (1 October 1879 – 1964) was a Chilean naval officer who served as head of the Chilean Navy from 1932 to 1938, first as Director General of the Navy and, in 1938, as Commander-in-Chief of the Navy.

Biography Reyes was born in Valparaíso on 1 October 1879. He pursued a career in the Chilean Navy, becoming a midshipman in 1897. He was promoted to commander in 1913, captain in 1920, rear admiral in 1926, and vice admiral in 1932.

In 1932, Reyes became Director General of the Chilean Navy, succeeding Rear Admiral Calisto Rogers. He headed the institution throughout most of the second presidency of Arturo Alessandri. Contemporary records identify him as the senior naval authority alongside officers including Rear Admiral Julio Allard, who commanded the Chilean Fleet during part of Reyes's tenure.

In 1938, the title of the Navy's highest-ranking officer was formally changed from Director General to Commander-in-Chief. Reyes was the first officer to hold the new designation, although only briefly, and was succeeded later that year by Vice Admiral Luis Álvarez Jaramillo.

Reyes retired with the rank of vice admiral. Among his foreign decorations was the Grand Cross of Spain's Order of Naval Merit. He died in 1964.

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