Leslie Copus Peltier (January 2 1900 – May 10, 1980) was an American astronomer.

He was born in Delphos, Ohio. An amateur astronomer, he was a prolific discoverer of comets and also a persistent observer of variable stars and member of the AAVSO. Harlow Shapley once described him as "the world's greatest non-professional astronomer".

He wrote the heart-warming autobiographical Starlight Nights (ISBN 0933346948), which evokes the magic of stargazing in simpler days, on a farm and without light pollution.

Asteroid 3850 Peltier is named in his honor, as is the Leslie Peltier Award of the Astronomical League.

Obituary

• JAVSO 9 (1980) 32