Walter S. Diehl may refer to:
- Walter Stuart Diehl (1893-1976), an American naval officer and pioneer in aerodynamics and aeronautical design.
- USNS Walter S. Diehl (T-AO-193), a United States Navy fleet replenishment oiler in service with the Military Sealift Command since 1988
This disambiguation page lists articles associated with the title Walter S. Diehl.
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