Ricardo Ernesto Víctor Rivera Schreiber, GBE (11 November 1892 – 25 July 1969) was a Peruvian diplomat who served as Minister of Foreign Affairs between 1952 and 1954.

[citation needed] He was educated at the Recoleta Sacred Heart School and University of San Marcos, where he obtained the bachelor and doctor degrees in jurisprudence in 1915.

Schreiber returned to Lima, where he performed as legal counsel of the Cerro de Pasco Copper Corporation and as professor of international law at the Pontifical Catholic University of Peru.

By April 1941, while he was posted in Tokyo, Schreiber was informed that the Japanese would enter the war with an attack on Pearl Harbor and warned the United States Embassy.

The U.S. State Department disqualified the report and when the naval base was attacked nine months later, he was confined under house arrest in the Japanese mountains at Miyanoshita.

The Peruvian and American missions were evacuated from Japan in June 1942 on the Asama Maru and were later exchanged for Japanese diplomats in Lourenço Marques.

Retaining this posting, Schreiber was President of the Peruvian Delegation to the Preparatory Commission for the United Nations and was nominated Vice-President of its Legal Committee in 1945.