Up the Downstair is the second studio album by English progressive rock band Porcupine Tree, first released in June 1993.

It was originally intended to be a double album set including the song "Voyage 34", which was instead released as a single in 1992, and other material that ended up on the Staircase Infinities EP (1994).

In 2005, it was partially re-recorded, fully re-mixed, remastered and re-released along with the Staircase Infinities EP as a double album.

This is identical to the 2005 release, except it is printed on coloured vinyl and the Staircase Infinities disc contains the song "Phantoms".

[4] According to Wilson, Up the Downstair channeled "the Orb and the Future Sound of London, but also Floyd and Ozric Tentacles.