Others
- William Owen (Royal Navy officer) (1737–1778), British Royal Navy officer and settler of Campobello Island, Canada
- William Owen (painter) (1769- 1825), British portrait painter.
- William Fitzwilliam Owen (1774–1857), British Royal Navy vice-admiral and explorer
- William Owen (composer) (1814–1893), Welsh composer of hymn tunes, including Bryn Calfaria
- William David Owen (1874–1925), Welsh novelist
- Sir William Owen (judge) (1899–1972), Justice of the High Court of Australia
- William T. Owen (1905–1942), Australian Army officer killed in action during World War II
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