Robert FitzRoy (1805–1865) was a Royal Navy vice admiral known for being captain of HMS Beagle during Charles Darwin's voyage.
Admiral FitzRoy may also refer to:
- Henry FitzRoy, Duke of Richmond and Somerset (1519–1536), Lord High Admiral of England, an honorary title with no corresponding authority
- Robert O'Brien FitzRoy (1839–1896), British Royal Navy vice admiral
- Lord William FitzRoy (1782–1857), British Royal Navy rear admiral