poets.org
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Poets.org is the official site of the Academy of American Poets, offering a vast archive of poems and poet bios, plus essays, teaching resources, and guidance on reading and writing poetry (including haiku). It also features daily poems and opportunities for learning and engagement.
More resources on Haiku
Modern Haiku
Premier English-language haiku journal with archives and submissions
Tiny Words
Daily haiku, contests, and short form poetry inspiration
Haiku Society of America
Promotes haiku poetry with definitions, archives, and member resources
The Haiku Foundation
Free resources, archives, journals, and frogpond magazine for haiku enthusiasts
The Haiku Handbook
The Haiku Handbook - A book resource
haikuworld.org
HaikuWorld.org is an online resource for learning and practicing haiku, offering guides on haiku forms and technique along with a collection of example poems to study and write.