Shigitatsu-an (Japanese: 鴫立庵) is a haikai dojo (Japanese: 俳諧道場) in Ōiso, Kanagawa, Japan, where people learn haiku poetry from the master there or from each other. It is one of the three important such dojo, the other two being Rakushi-sha (落柿舎) in Sagano, Kyoto, and Mumei-an (無名庵) in Ōtsu, Shiga.
Shigitasu-an was built in 1664 by Sōsetsu (崇雪) as a humble hut on the rivulet, Shigitatsu-sawa, Ōiso, where the 12th century waka poet, monk Saigyō, was said to write one of his most famous poems which was later included in the Shin Kokin Wakashū:  
こころなき 身にもあはれは 知られけり
Kokoro naki mi nimo aware wa shirare keri
Shigitatsu-sawa no aki no yūgure
Known to me who has denied joy and sorrow of this world is
The autumn scene of the rivulet where sandpipers walk at dusk.
Shigitatsu-an was built on Tokiado, the main thoroughfare between Edo and Kyoto, which is now National Route 1. There stands a stele erected by Oiso Town that the word "Shōnan" was first mentioned by Sosetsu introducing Shigitatsu-an to the passers-by.