Ernest Dichmann Peek (November 19, 1878 – April 22, 1950) was a major general in the United States Army, who commanded the 9th Corps Area at the beginning of World War II.

Peek graduated fourth in his class at the United States Military Academy on February 18, 1901, and joined the Corps of Engineers.

Peek was decorated with the Silver Star for gallantry in action against the Moros during this service.

From 1912 to 1926 he supervised improvements of the harbor on Lake Superior and was also in charge of the building of Lock and Dam No.

During World War I, Peek served with 21st Engineers within American Expeditionary Force in France.