Allium siskiyouense is a North American species of wild onion known by the common name Siskiyou onion. It is native to the Klamath Mountains and nearby ranges of northern California and Oregon. It grows in serpentine and other rocky soil types.

This small onion plant grows from a reddish-brown bulb 1 or 2 cm (1⁄3 or 2⁄3 in) long. It produces a short stem no more than 8 cm (3 in) long and two sickle-shaped leaves which are usually longer. The inflorescence contains up to about 35 flowers, each with dark-veined pink tepals around 1 cm (1⁄3 in) long and sometimes toothed at the tips.

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