Russell Kelly Pitzer (September 3, 1878 – July 1978) was an American orange grower and philanthropist.
The family moved to Brown County, Nebraska and Boulder, Colorado, before settling in Pomona, California.
He then attended Hastings Law School in San Francisco, a unit of the University of California, Berkeley.
He also became a principal in the Pomona Valley Telephone and Telegraph Union and the Home Builders Savings and Loan Association.
Flora S. Pitzer died in 1927 and he subsequently married Ina Scott.