University of Erlangen–Nuremberg Paul von Ragué Schleyer (February 27, 1930 – November 21, 2014) was an American physical organic chemist whose research is cited with great frequency.

He published twelve books in the fields of lithium chemistry, ab initio molecular orbital theory and carbonium ions.

He was past president of the World Association of Theoretically Oriented Chemists, a fellow of the International Academy of Quantum Molecular Science and editor-in-chief of the Encyclopedia of Computational Chemistry.

He then earned his Ph.D. degree from Harvard University in 1957, where he worked under physical organic chemist Paul Doughty Bartlett.

In his research, Schleyer has made contributions in the area of synthesis of adamantane and other cage molecules by rearrangement mechanisms.