Research Excellence through STEM Inclusion Act This bill directs the National Science Foundation (NSF) to appoint a senior agency official within the Office of the Director of the NSF as a Chief Diversity Officer. The Chief Diversity Officer shall direct the Office of Diversity and Inclusion of the NSF and report directly to the Director. The Chief Diversity Officer shall be responsible for providing advice on policy, oversight, guidance, and coordination with respect to matters of the NSF related to diversity and inclusion, including ensuring the geographic diversity of the NSF's programs.