"Within You Without You" is a song by the English rock band the Beatles from their 1967 album Sgt. Pepper's Lonely Hearts Club Band. Written by lead guitarist George Harrison, it was his second composition in the Indian classical style, after "Love You To", and inspired by his stay in India in late 1966 with his mentor and sitar teacher Ravi Shankar. Recorded in London without the other Beatles, it features Indian instrumentation such as sitar, tambura, dilruba and tabla, and was performed by Harrison and members of the Asian Music Circle. The recording marked a significant departure from the Beatles' previous work; musically, it evokes the Indian devotional tradition, while the overtly spiritual quality of the lyrics reflects Harrison's absorption in Hindu philosophy and the teachings of the Vedas.

The song was Harrison's only composition on Sgt. Pepper, although his endorsement of Indian culture was further reflected in the inclusion of yogis such as Paramahansa Yogananda among the crowd depicted on the album's cover. With the worldwide success of the album, "Within You Without You" presented Indian classical music to a new audience in the West and contributed to the genre's peak in international popularity. It also influenced the philosophical direction of many of Harrison's peers during an era of utopian idealism marked by the Summer of Love. The song has traditionally received a varied response from music critics, some of whom find it lacklustre and pretentious, while others admire its musical authenticity and consider its message to be the most meaningful on Sgt. Pepper. Writing for Rolling Stone, David Fricke described the track as "at once beautiful and severe, a magnetic sermon about materialism and communal responsibility in the middle of a record devoted to gentle Technicolor anarchy".

For the Beatles' 2006 remix album Love, the song was mixed with the John Lennon-written "Tomorrow Never Knows", creating what some reviewers consider to be that project's most successful mashup. Sonic Youth, Rainer Ptacek, Oasis, Patti Smith, Cheap Trick and the Flaming Lips are among the artists who have covered "Within You Without You".