Udall Foundation Reauthorization Act of 2023 This bill reauthorizes through FY2028 the Morris K. Udall and Stewart L. Udall Foundation, its Environmental Dispute Resolution Fund, and the foundation's support for training of health care and public policy professionals through the Native Nations Institute. The foundation, an independent executive branch agency, works to strengthen (1) the stewardship of the environment, public lands, and natural resources; and (2) Native Nations to facilitate their self-determination, governance, and human capital goals.