Herbert H. McMillan (born May 30, 1958) is a Republican former member of the Maryland House of Delegates, representing District 30 in Anne Arundel County, MD from 2003 to 2007 and from 2011 to 2019. He served alongside Democrat Michael E. Busch and Republican Ron George. In 2006 he challenged District 30 Senator John Astle, a Democrat, who defeated him 53 percent to 47 percent. In 2022, McMillan unsuccessfully ran for the Republican nomination for Anne Arundel County executive.