Robert Gardner Bartle (November 20, 1927 – September 18, 2003) was an American mathematician specializing in real analysis.
He is known for writing the popular textbooks The Elements of Real Analysis (1964), The Elements of Integration (1966), and Introduction to Real Analysis (2011) with Donald R. Sherbert, published by John Wiley & Sons.
He was on the faculty of the Department of Mathematics at the University of Illinois from 1955 to 1990.
Bartle was Executive Editor of Mathematical Reviews from 1976 to 1978 and from 1986 to 1990.
In 1997, he earned a writing award from the Mathematical Association of America for his paper "Return to the Riemann Integral".