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.

In 2022, McMillan unsuccessfully ran for the Republican nomination for Anne Arundel County executive.

Following his first term in the House, McMillan ran for the State Senate and was defeated by incumbent John Astle.

McMillan was also appointed as the Chief Deputy Minority Whip, a position he held till his retirement form the House of Delegates.

He was also a member of the Anne Arundel County Delegation, where he was the chair of the Capital Projects/Bond Bill Subcommittee, from 2011-2018.