Paul S. Weiss (born October 10, 1959) is a leading American nanoscientist at the University of California, Los Angeles. He holds numerous positions, including UC Presidential Chair, Distinguished Professor of Chemistry and Biochemistry,Bioengineering, and of Materials Science and Engineering,and founder and editor-in-chief of ACS Nano. From 2019–2014, he held the Fred Kavli Chair in NanoSystems Sciences and was the director of the California NanoSystems Institute.Weiss has co-authored over 400 research publications and holds over 40 US and international patents.