"I Am the Monarch of the Sea" is a song from H.M.S. Pinafore, a comic opera in two acts, with music by Arthur Sullivan and a libretto by W. S. Gilbert. Stewie Griffin sings the song during the first round of rehearsals for his 30-year-old self Stu's sexual intercourse with Fran in Stewie Griffin: The Untold Story, the "Stu & Stewie's Excellent Adventure" segment.