more generally, any member of the Puritan movement in English history

Roundhead Butte, a peak in the Buffalo Plateau of southern Montana

Roundhead, a peak near Fredericksburg, Texas

Roundhead, a darkwave band

Several organisms have the English common name "roundhead":

the offshore tip of a breakwater (structure)

roundhead, also known as longfin, is a common name for fish of the family Plesiopidae

Roundhead Mountain, a peak near Stanley, Virginia.

Roundhead Township, Hardin County, Ohio

roundhead is a common name occasionally used for mushrooms of the genus Stropharia

Roundhead, a supporter of the Parliamentarian and Puritan faction during the English Civil War

roundhead (weapon), a type of mace used during the English Civil War.

The roundhead galaxias (Galaxias anomalus), a species of galaxiid fish.

Roundhead, Ohio, an unincorporated community in Roundhead Township

The Roundheads (Doctor Who): The Roundheads is a series of Doctor Who novels

Roundhead, terminology commonly used in Melbourne, Australia to describe a Gunzel or Trainspotter.

Roundhead Studios, a New Zealand based music and sound recording studio owned by Neil Finn.