"Wonderful" is a song written by Brian Wilson and Van Dyke Parks for American rock band The Beach Boys. It was released on their 1967 album Smiley Smile, but was attempted earlier for the Smile sessions. Wilson claims that he and Parks wrote the song along with "Heroes and Villains" "Cabin Essence" and "Surf's Up" in a giant sandbox with a piano in it that Wilson had moved into his living room. When released on Smiley Smile, Parks' credit was omitted.

The song has since been covered by a variety of artists.

The song's title derives from a pet name Brian Wilson had for his wife Marilyn. It is the only Smile composition to refer to God by name,. Co-writer Van Dyke Parks observed,

Musically, it's entirely different from anything else. and I thought that it was a place, an opportunity, to begin a love song. I remember Brian pressing me about the relationship between the mother and the father and the child. And this is the guy who wrote "When I Grow Up (To Be A Man)", the guy who is becoming a man. I really think that he was thinking about his own personal progression from childhood. Now I thought, once we had gotten "Heroes And Villains" done, we might have seen a boy/girl song emerge, other than "Wonderful". Honestly, I really thought we would do it, but I never found an opportunity to pursue that with the music I was given.

Author Andrew Hickey interprets its lyrics to be the story of a girl devoted to God and her parents who is thrown into emotional disarray after encountering a member of the opposite sex. Biographer Mark Dillon describes the song as the story of a young woman and her steadfast embrace of adolescence through the loss of her own virginity. He also characterizes the original version of the recording as "proto-psychedelic chamber pop".

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