Timothy Aaron Morrison (born c. 1978) is an American Republican political adviser. He was briefly the top U.S. adviser to President Trump on Russia and Europe on the White House National Security Council, a position he took over from his predecessor Fiona Hill in August 2019, and from which he resigned on October 31, 2019.
[C-SPAN November 19, 2019
Impeachment Hearing with Ambassador Kurt Volker and National Security Aide Tim Morrison. Adam Schiff also shown. Kurt Volker, the former U.S. special envoy to Ukraine, and Tim Morrison, a National Security Council aide, publicly testified before the House Judiciary Committee as part of impeachment inquiry of President Trump.]

Before that, he served as senior director for countering weapons of mass destruction on the US National Security Council, a position he assumed on July 9, 2018. Until then, he was policy director for the Republican staff on the House defense panel. Morrison entered politics as a professional staff member to Rep. Mark Kennedy, from 2000 to 2007. One day before his scheduled testimony to the impeachment inquiry against Donald Trump on October 31, 2019, Morrison was reported to soon leave his post as the senior director for European and Russian affairs on the National Security Council, to be replaced by Andrew Peek, currently Deputy Assistant Secretary of State for Iraq and Iran in the Bureau of Near Eastern Affairs.

Morrison holds a Juris Doctor from George Washington University and a BA in Political Science from the University of Minnesota.