Douglas Arthur Sims II[1] is a United States Army lieutenant general who has served as director of the Joint Staff since January 2024.

He most recently served as the director of operations of the Joint Staff from 2022 to 2024.

[2][3] He served as commanding general of the 1st Infantry Division and Fort Riley from 2020 to 2022, and prior to that served as deputy director for Regional Operations and Force Management of the Joint Staff from 2018 to 2020.

[4][5] In October 2023, Sims was nominated for appointment as director of the Joint Staff.

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