"Disaster" is the fifth episode of the fifth season of the American science fiction television series Star Trek: The Next Generation, the 105th episode overall. It was originally released on October 21, 1991, in broadcast syndication. Set in the 24th century, the series follows the adventures of the crew of the Federation starship Enterprise.

The crew of the Enterprise are undertaking routine tasks when suddenly the ship is struck by some outside force, rendering much of it inoperable and many of the crew isolated without communication to other sections; later the crew discovers the collision was with a fragment of a quantum filament, and after effecting basic repairs, set course back to the nearest starbase for a full overhaul.

Several different sub-plots are followed among the various crew members:

Zach Handlen of The A.V. Club rated the episode a B+, stating it "tries to do too much, but its ambition does it credit, and when it works, it's very charming". Jeremy Conrad of IGN considered it one of the under-appreciated episodes of Season Five, being "a classic "disaster movie" set in the Star Trek universe" with some funny moments. Charlie Jane Aldres of io9 ranked "Disaster" as the 94th best episode of all the Star Trek series in a 2014 list.

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