"A Supermarket in California" is a poem by American poet Allen Ginsberg first published in Howl and Other Poems in 1956. In the poem, the narrator imagines visiting a supermarket in California where he finds Federico García Lorca and Walt Whitman shopping. Whitman, who is also discussed in "Howl", is a character common in Ginsberg's poems, and is often referred to as Ginsberg's poetic model. "A Supermarket in California", written in Berkeley and published in 1956, was intended to be a tribute to Whitman in the centennial year of the first edition of Leaves of Grass.
For its critique of mainstream American culture, the poem is considered to be one of the major works of the Beat Generation, which included other authors of the era such as Jack Kerouac, William Seward Burroughs, and Lawrence Ferlinghetti. Ginsberg achieved critical success in 1956 with the publication of Howl and Other Poems, with "Howl" being the most popular of the works in the collection. Like "Howl", "A Supermarket in California" was a critique of postwar America, yet in the poem the narrator focuses more on consumerist aspects of society by contrasting his generation with Whitman's.
"A Supermarket in California" is a prose poem with an irregular format that does not adhere to traditional poetic form including stanza and rhyme scheme. The format is a resemblance of the long-winded aspect of speech. The long-line style is attributed to Whitman and "as with Whitman, by the time we have traversed the stretch of one of these long lines, we have experienced a rapid set of transformations." This is shown within the poem’s location, the metaphorical supermarket and its symbolism of Ginsberg’s America. The form of Ginsberg's poem comes from "his knowledge of Walt Whitman's long-line style" which was an experiment for Ginsberg before he adapted it to all his works later on.