Fungi from Yuggoth is a sequence of 36 sonnets by cosmic horror writer H. P. Lovecraft. Most of the sonnets were written between 27 December 1929 – 4 January 1930; thereafter individual sonnets appeared in Weird Tales and other genre magazines. The sequence was published complete in Beyond the Wall of Sleep (Sauk City, Wisconsin: Arkham House, 1943, 395–407) and The Ancient Track: The Complete Poetical Works of H. P. Lovecraft (San Francisco: Night Shade Books, 2001, 64–79; expanded 2nd ed, NY Hippocampus Press, 2013). Ballantine Books’ mass paperback edition, Fungi From Yuggoth & Other Poems (Random House, New York, 1971) included other poetic works.

The sequence has been printed in several different versions as standalone chapbooks. In June 1943, Bill Evans (Washington DC) issued a separate appearance which lacked the final three sonnets. In 1977 Necronomicon Press, (West Warwick, RI) issued the complete sequence as The Fungi from Yuggoth (475 numbered copies). This may have been the first time that the sequence was published in its corrected text. The same press went on to reissue it with new cover artwork by Jason Eckhardt in limited editions from 1982 onwards and other illustrated editions from different presses were to follow. In 2017 came a limited annotated edition of the sequence with illustrations by Jason Eckhardt for each poem (Hippocampus Press, New York).

Lovecraft is known chiefly as a writer of genre fiction, several themes from which are reflected in his sonnet sequence. But the restrained style of the verse there so distinguishes it from the prose work that, in the view of some commentators, it "deserves to be more widely known and appreciated" for its own poetic merits. The work later appealed to musicians and there have been several settings of poems from it in a variety of genres.