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The Ihon Shimei-shō (異本紫明抄) is a five-volume commentary on The Tale of Genji.

Title
The work known as the Ihon Shimei-shō has its title indicated both on its daisen (題簽, a label attached to the cover of an old Chinese and Japanese book) and in its okugaki (奥書, a note appended to the end of a text) as Shimei-shō (紫明抄). On the other hand, its naidai (内題, a title indicated at the opening of the main text of an old Chinese or Japanese book) is Hikaru Genji Monogatari Shō (光源氏物語抄), and it is unrelated to the  by the 13th-century Buddhist monk and waka poet Sojaku (素寂). As a result of this problem modern scholars call it the Ihon Shimei-shō, or literally "Shimei-shō variant text".

Authorship and date
It is of uncertain authorship, with one theory attributing it to Fujiwara no Tokitomo (藤原時朝).