Struve's Lost Nebula was nebulosity reported by Otto Wilhelm Struve in 1868, and verified by Heinrich d'Arrest, in the vicinity of Hind's Variable Nebula (NGC 1555) in Taurus. Although given a separate catalogue number (NGC 1554) by Dreyer, it was not seen by observers a decade after Struve's discovery, nor has it been seen since. Modern sources, such as Sky Catalogue 2000.0 group NGC 1554 and NGC 1555 together as a single object, although 1554 is not visible on the Palomar Sky Survey plates. At the reported position of the Lost Nebula is a magnitude 14 star, 4' west-southwest of T Tauri. It appears that the Lost Nebula may have been a transient portion of the reflection nebula complex in this part of the sky.