William Lowndes
William Lowndes is the name of the following people:
- William Lowndes (politician, 1652) (1652-1724), British politician
- William Lowndes (Politician, 1782) (1782-1822), American politician (South Carolina)
- William Lowndes Yancey (1814–1863), American politician
- William Selby Lowndes (~ 1767–1840), British politician
- William Thomas Lowndes (~ 1798–1843), English bibliographer