Peter Augustus Jay (August 23, 1877 – October 18, 1933) was an American diplomat who served as U.S. General Consul to Egypt, U.S. Minister to El Salvador and Romania and U.S.

"[10] He served in Japan until December 21, 1909 when he was appointed by President William Howard Taft as Consul General to Egypt in Cairo.

[1] On May 4, 1920, Jay was appointed U.S. Minister to El Salvador by President Woodrow Wilson, serving from February 10, 1921, until April 28, 1921.

[1] After being appointed on April 18, 1921 by President Warren G. Harding, he served from June 30, 1921 to May 9, 1925, as U.S. Minister to Romania, where he assisted in negotiating that country's repayment terms of $42,000,0000 for wartime and post World War I development loans.

Two days later, on December 30, 1926, he resigned his post and returned to Washington, D.C.[11][12] In 1928, he was appointed the American member of the Permanent International Commission established under the treaty between the United States and Spain on September 15, 1914.