Others
- William Robertson (Australian settler) (1798–1874), Scottish-born pioneer in Tasmania and Victoria
- William Robertson (Hebraist), Scottish Hebraist
- William B. Robertson (1893–1943), American aviator and aviation executive
- William "Rip" Robertson (died 1973), American covert agent
- William Robertson (historian) (1721–1793), Scottish writer and academic
- William Bruce Robertson (1820–1886), Scottish Secession/United Presbyterian Church minister
- William Robertson (Irish priest) (1705–1783), Irish clergyman, theological writer and schoolmaster
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