Octavius may refer to:
Topics of Antiquity Augustus, or Octavius, the first Roman emperor Octavia gens, ancient Roman family (includes a list of its members known as Octavius) Octavius (praenomen), a Latin personal name Octavius Mamilius, 5th-century BC ruler in Italy Octavius (King of the Britons) or Eudaf Hen, a figure in Welsh mythology Octavius (dialogue), a 2nd-century defence of Christianity
Modern-era people with the name Prince Octavius of Great Britain (1779–1783), son of King George III Octavius Beale (1850–1930), Australian piano manufacturer Octavius Catto (1839–1871), American educator and civil rights activist Octavius Coope (1814–1886), English businessman and politician Octavius Duncombe (1817–1879), English politician Octavius Ellis (born 1993), American basketball player Octavius Frothingham (1822–1895), American clergyman Octavius D. Gass (1828–1924), American businessman and politician Octavius Gilchrist (1779–1823), English antiquary Octavius Hadfield (1814–1904), New Zealand bishop Octavius Hammond (1835–1908), English clergyman Octavius Leigh-Clare (1841–1912), English lawyer and politician Octavius Mathias (1805–1864), New Zealand clergyman Octavius Vaughan Morgan (1837–1896), Welsh politician Octavius Oakley (1800–1867), English artist Octavius Pickard-Cambridge (1828–1917), English zoologist Octavius Radcliffe (1859–1940), English cricket player Octavius Ryland (1800–1886), Australian educator Octavius Sturges (1833–1895), English physician Octavius Temple (1784–1834), colonial administrator in Sierra Leone Octavius Terry (born 1972), American athlete Octavius Vernon-Harcourt (1793–1863), Royal Navy officer Octavius Wigram (1794–1878), English businessman Octavius Winslow (1808–1878), English clergyman
Other uses Octavius (ship), an 18th-century ghost ship Pint or octavius, a unit of measurement Octavius, a fictional character in a series of silent films portrayed by actor Herbert Yost Octavius (horse), a 19th-century racehorse
See also Gaius Octavius (disambiguation) Gnaeus Octavius (disambiguation) Lucius Octavius (name) Marcus Octavius Octavian (disambiguation) Ottavio Otto Octavius or Dr. Octopus, a villain of the Spider-Man comics