Watson C. Warriner Sr. (1917-2015) was a chemical engineer with E.I. du Pont de Nemours & Company during World War II. He worked on the Manahatten Project.

Warriner was born in Richmond, Virginia, on April 4, 1917. He graduated from Virginia Polytechnic Institute with a degree in chemical engineering in 1938. He was employed in the Engineering Department of E.I. du Pont de Nemours & Company from 1939 to 1955, and subsequently in the Plastics Department until 1981. During World War II, Warriner was assigned to the heavy water group of DuPont's contribution to the Manhattan Project, and in early 1944, he was transferred to the separations area and sent to Hanford, Washington, where he helped design and build the chemical separation plants known as "Queen Marys." After the war, he was transferred to the Savannah River plant. He took an active role in the post-war activities of Manhattan Project veterans and supported the Atomic Heritage Foundation. He died at Greenville, Delaware, on September 17, 2015, at age 97.