Thomas Denny Sanford (born December 23, 1935, in Saint Paul) is a South Dakota businessman and philanthropist.
He is the founder and owner of First Premier Bank and the chairman and chief executive officer of its bank holding company, United National Corporation.
Sanford is part of an increasingly popular trend, sunset philanthropy, and has pledged to give away his entire fortune during his lifetime as opposed to leaving it to a foundation that exists in perpetuity.
As of October 2018 he has donated over $1 billion.