An informal list of opportunities:
University Dissertation Research and Dissertation Completion Fellowships (Penn)
American Philosophical Society
Consortium for the History of Science, Technology and Medicine
Linda Hall Library Fellowship program
Science History Institute
Smith Richardson Foundation https://www.srf.org/programs/international-security-foreign-policy/world-politics-statecraft-fellowship/
ACLS/Mellon Fellowship
Mellon/Penn Program in the Environmental Humanities Fellowship
For more options, link to "Graduate Student Awards and Prizes" and view funding awards of current and past graduate students.