A Sea-Spell is an oil painting of 1877 and an accompanying sonnet of 1869 by the English artist Dante Gabriel Rossetti, depicting a siren playing an instrument to lure sailors.

[4] The artist's brother William Michael Rossetti described the subject as "a Siren, or Sea-Fairy, whose lute summons a sea-bird to listen, and whose song will prove fatal to some fascinated mariner".

[5][10] The text of the poem is as follows: Her lute hangs shadowed in the apple-tree, While flashing fingers weave the sweet-strung spell Between its chords; and as the wild notes swell, The sea-bird for those branches leaves the sea.

She sinks into her spell: and when full soon Her lips move and she soars into her song, What creatures of the midmost main shall throng In furrowed surf-clouds to the summoning rune: Till he, the fated mariner, hears her cry, And up her rock, bare-breasted, comes to die?

She wrote that the iconic image of womanhood dominated Rossetti's "dream world", and that the painting is intended to evoke similar reveries in the viewer, citing its musical theme as a prompt for "indolent musing".

She argued that, although the combination of daydreaming and womanhood in A Sea-Spell could be pornographic, Rossetti encourages more spiritual responses, emphasizing the subject's face and making her exposed arms "masculine, or at best matronly".