McDiarmid, also MacDiarmid, is a Scottish surname, and may refer to:
Ian McDiarmid, Scottish Tony award theatre actor and director
Jack McDiarmid (1903–1974), Australian rules footballer
John McDiarmid (tennis) (1911-1982), American tennis player
John B. McDiarmid (1913-2002), Canadian academic and military intelligence officer
John Stewart McDiarmid (1882-1965), Canadian Liberal politician, later Lieutenant Governor of Manitoba
Matthew McDiarmid (1914-1996), Scottish literary scholar, essayist and poet
Alan MacDiarmid (1927–2007), chemist, won the Nobel Prize in Chemistry in 2000
Finlay Melrose MacDiarmid ("Toby") (1925–2003), Australian politician
Hugh MacDiarmid (1892–1978), Scottish poet, pen name of Christopher Murray Grieve
Jane MacDiarmid, Canadian politician (first elected 2004)
Margaret MacDiarmid, Canadian politician (first elected 2009)
Sarah MacDiarmid, a woman who disappeared in Melbourne, Australia, in 1990
William Burton MacDiarmid (1875–1947), Canadian politician
McDiarmid Wikipedia (Text) CC BY-SA