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Percy Lebaron Spencer (9 July 1894 - 8 September 1970) was an American engineer and inventor. He became known as the inventor of the microwave oven.

Spencer was born in Howland, Maine. His father died in 1897, and his mother left him a short time later. He lived with his aunt and uncle after that. He never graduated from grammar school, but went to work in a mill as an apprentice at age 12, before joining the U.S. Navy in 1912 to learn wireless telegraphy. He joined the Raytheon Company in the 1920s.

In 1941, magnetrons, which were used to generate the microwave radio signals that are the core mechanism of radar, were being made at the rate of 17 per day at Raytheon. While working there, Spencer developed a more efficient way to manufacture them, by punching out and soldering together magnetron parts, rather than using machined parts. His improvements were among those that increased magnetron production to 2,600 per day. For his work he was awarded the Distinguished Public Service Award by the US Navy.

In 1945, a peanut bar in his pocket melted while standing in front of an operating magnetron. He then tested popcorn in front of the magnetron (surely turning up the power and standing out of the beam), and it quickly popped all over the room. Development of the microwave oven grew out of these observations, and by 1947 a commercial oven was being sold by Raytheon.

He became Senior Vice President and a senior member of the Board of Directors at Raytheon. He received 300 patents during his career at Raytheon; a building there is named after him. Spencer was married and had three children, James, John, and George.

The first microwave oven weighed 750 pounds and was 5 feet tall. it was used mainly in places like cruise ships and restaurants where a lot of food had to be cooked

• "Gramps - How an orphan from Maine became the Edison of the modern age", by Rod Spencer
• http://www.inventionatplay.org/inventors_spe.html
• http://www.invent.org/hall_of_fame/136.html
• http://www.gallawa.com/microtech/history.html
• "Percy Spencer and His Itch to Know", By Don Murray, Reader's Digest, August 1958