Douglas Sims II

Douglas Sims II
Nickname(s)	DA
Allegiance	United States
Service/branch	United States Army
Years of service	1991–present
Rank	Lieutenant General
Commands held	1st Infantry Division 2nd Cavalry Regiment 1st Squadron, 2nd Cavalry Regiment
Battles/wars	War in Afghanistan Iraq War
Awards	Army Distinguished Service Medal Defense Superior Service Medal Legion of Merit (2) Bronze Star Medal (3)
Alma mater	United States Military Academy Webster University (MA) Massachusetts Institute of Technology

Douglas Arthur Sims II is a United States Army lieutenant general who serves as the director of operations of the Joint Staff. He most recently served as commanding general of the 1st Infantry Division and Fort Riley from August 14, 2020, to May 11, 2022, and prior to that served as deputy director for Regional Operations and Force Management of the Joint Staff from June 2018 to June 2020.

In October 2023, Sims was nominated for appointment as director of the Joint Staff.