| birth_place = Sioux City, Iowa, U.S.
| alma_mater = Wheaton College
| office = Senior Director for Global Health Security and Biothreats, U.S. National Security Council
| president = Donald J. Trump
| predecessor = Elizabeth Cameron
| successor = Elizabeth Cameron (2021)
| term_start = April 2017
| term_end = May 8, 2018
| office1 = U.S. Global Malaria Coordinator, United States Agency for International Development
| president1 =
| predecessor1 = ''Office established''
| successor1 = Kenneth Staley
| termstart1 = June 2006
| termend1 = April 2017
| image = Official Naval portrait of Rear Admiral (lower half) Robert T. Ziemer.jpg
| caption = Ziemer in 1996
| module =
| serviceyears =
| rank = Rear Admiral
| servicenumber =
| unit =
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}}
}}
R. Timothy Ziemer (born 1946) is an American retired naval officer. He was a U.S. Navy helicopter pilot in the Vietnam War, commanded several squadrons and an air wing during the First Gulf War, and completed his Navy career as commander of the Navy's Mid-Atlantic Region, with the rank of rear admiral. After retiring he became an expert in global disaster response and health threats. He led the President's Malaria Initiative from 2006 until 2017, then joined the National Security Council as the director in charge of global health security and biothreats, serving until May 8, 2018, when the position was abolished by the Trump administration.
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