Seamus may refer to:

• Séamus, a Gaelic male given name

• Seamus (Family Guy), a character on the television series Family Guy
• Seamus, a pigeon in Cats & Dogs: The Revenge of Kitty Galore
• Seamus McFly, a fictional Irish character from Back to the Future Part III (Marty McFly's Great Great Grandfather)
• M/V Seamus (934TXS), a space salvage freighter, and the primary setting for Archer season 10, "Archer: 1999"

• "Seamus" (song), the fifth song on Pink Floyd's 1971 album Meddle

• Society for Electro-Acoustic Music in the United States
• Seamus (dog), a dog belonging to U.S. presidential candidate Mitt Romney
• Seamus Finnigan, a character in Harry Potter by J.K. Rowling

• All pages with titles beginning with Seamus
• All pages with titles containing Seamus
• Sheamus (born 1978), Irish professional wrestler
• Shamus (disambiguation)