Álvaro de Campos (European Portuguese pronunciation: [ˈalvɐɾu ðɨ ˈkɐ̃puʃ]; October 15, 1890 – November 30, 1935) was one of the poet Fernando Pessoa's various heteronyms, with a reputation for a powerful and angry style of writing.

After some time in Ireland, Campos sailed to the Far East, and wrote his poem "Opiário" on board ship in the Suez Canal.

He chose Whitman and Marinetti as masters, showing some similarities with their works, mainly in the second phase: hymns like "Ode Triunfal", "Ode Marítima", and "Ultimatum" praise the power of rising technology, the strength of machines, the dark side of industrial civilization, and an enigmatic love for machines.

The first phase (marked by the poem Opiário) derived some of its pessimism from Pessoa's friend Mário de Sá-Carneiro, with whom he had collaborated on the Orpheu magazine.

Campos manifests two contrary impulses: on the one hand: a feverish desire to be everything and everyone, declaring that 'in every corner of my soul stands an altar to a different god.'

Critics have noted how Whitman's influence is partly apparent in the poems' sheer vitality; in the zest expressed for experience.

Indeed Campos has in many respects outdone the poet who, by 'containing multitudes', had provided his muse: it seems the entire cosmos might yet not have exceeded his capacity to 'contain'.

For a critic he is 'par excellence the poet appalled by the emptiness of his own existence; lethargic, lacking in will-power, seeking inspiration, or at all events finding it, in semi-conscious states; in the twilight world between waking and sleeping; in dreams and in drunkenness'.