Admiral O'Brien may refer to:
- Donat Henchy O'Brien (1785–1857), British Royal Navy rear admiral
- Edward O'Bryen (sometimes O'Brien) (c. 1753–1808), British Royal Navy rear admiral
- James O'Brien, 3rd Marquess of Thomond (1769–1855), British Royal Navy admiral
- John O'Brien (admiral) (1918–1996), Canadian Forces vice admiral
- William O'Brien (Royal Navy officer) (1916–2016), British Royal Navy admiral
This disambiguation page lists articles associated with the title Admiral O'Brien.If an internal link led you here, you may wish to change the link to point directly to the intended article. Categories: