Atticus may refer to:

• Atticus, an adjective Latin name meaning "Athenian" or "of Attica"

• Dionysius Atticus, rhetorician of the 1st century BC from Pergamon
• Vipsanius Atticus, also a rhetorician of the 1st century BC from Pergamon, who may or may not be the same person as Dionysius Atticus
• Curtius Atticus, companion of the Roman emperor Tiberius
• Atticus (philosopher) (fl. c. 175), Platonist philosopher and author of lost Platonic commentary
• Atticus, Christian martyr, one of Agapius, Atticus, Carterius, Styriacus, Tobias, Eudoxius, Nictopolion, and Companions (d. 310)
• Atticus of Constantinople (406–425)
• Herodes Atticus (101–177), Greek rhetorician
• Titus Pomponius Atticus (112/109 – 35/32 BC), ancient Roman littérateur, philosopher, and correspondent with Cicero
• Atticus Browne (born 1991), West Indian cricketer
• Atticus Greene Haygood (1839–1896), Methodist bishop and president of Emory University
• Atticus Mitchell (born 1993), Canadian actor and musician
• Atticus Ross (born 1968), English musician
• Atticus Shaffer (born 1998), American actor
• Atticus (poet), pseudonymous Canadian poet

• Atticus, a character in Cicero's De Legibus
• Atticus, a character in The 39 Clues series of young adult novels
• Atticus Aldridge, a character in the television series Downton Abbey
• Atticus Busby, a character in the Australian television series Little Lunch
• Atticus Fetch, a character in the television series Californication
• Atticus Finch, a central character in the novel To Kill a Mockingbird
• Atticus Freeman, a character in the television series Lovecraft Country
• Atticus King, a character in the comic series King of Spies by Mark Millar
• Atticus Kodiak, a character in novels by Greg Rucka
• Atticus Lincoln, a character in the television series Grey's Anatomy
• Sir Atticus Moon, a character in Big Time Movie
• Atticus Murphy Jr., a character in the television series Todd and the Book of Pure Evil
• Admiral Atticus Noble, a sadistic military leader and character of the Netflix space opera Rebel Moon
• Atticus O'Sullivan, the main character of the novel series The Iron Druid Chronicles
• Atticus Pünd, the detective in Anthony Horowitz's Magpie Murders
• Atticus Rhodes, a character in the English dub of the Japanese anime Yu-Gi-Oh! GX
• Atticus Turner, a character in the novel Lovecraft Country

• Atticus (band), an alternative rock band from Knoxville, Tennessee
• Atticus (novel), a 1996 novel by Ron Hansen
• Atticus Circle, non-profit organization advocating for LGBT issues in Texas
• Atticus Clothing, clothing line developed by musicians
• Atticus the Storyteller's 100 Greek Myths, collection of Greek mythology by Lucy Coats
• Atticus, part of the tympanic cavity of the middle ear
• Atticus (given name)