David Jonathan Gross is an American particle physicist and string theorist.

Along with Frank Wilczek and David Politzer, he was awarded the Nobel Prize in Physics for their discovery of asymptotic freedom. He is the former director and current holder of the Frederick W. Gluck Chair in Theoretical Physics at the Kavli Institute for Theoretical Physics of the University of California, Santa Barbara. He is also a faculty member in the UC Santa Barbara Physics Department and is currently affiliated with the Institute for Quantum Studies at Chapman University in California.

Gross received his Bachelor's degree and Master's degree from the Hebrew University of Jerusalem, Israel, and his PhD in physics from the University of California, Berkeley. He was a Junior Fellow at Harvard University and a Professor at Princeton University until 1997. He was the recipient of a MacArthur Foundation Fellowship in 1987, the Dirac Medal in 1988 and the Harvey Prize in 2000.

Gross, with Jeffrey A. Harvey, Emil Martinec, and Ryan Rohm also formulated the theory of the heterotic string. The four were to be whimsically nicknamed the Princeton String Quartet