Roger Millar is an American land use engineer and government official serving as the Washington Secretary of Transportation.

Millar became a Fellow of the American Society of Civil Engineers in 1999.

Miller has served in various capacities for the state Departments of Transportation of Florida, Michigan, Minnesota, Oregon, Tennessee, and Vermont.

[2] Millar became Deputy Secretary of the Washington State Department of Transportation in October 2015, and was installed as Acting Secretary after Lynn Peterson, the previous secretary, was removed by the Washington State Senate.

[3][4] His appointment ends with the election of Bob Ferguson.