In Star Trek, the Rules of Acquisition are a set of Ferengi guidelines, intended to ensure the profitability of businesses owned by the ultra-capitalist Ferengi. In the story, the first rule was made by Gint, the first Grand Nagus of the Ferengi Alliance.

There are 285 Rules of Acquisition, but not all of them have been stated in the Star Trek canon. Most of the rules were written by Ira Steven Behr, a producer of Star Trek: Deep Space Nine, and he has published them in a book (ISBN 0671529366), the cover of which credits authorship as being "By Quark as told to Ira Steven Behr". A few rules have been stated on Star Trek: Voyager.

Some of the Rules of Acquisiton include:

1. Once you have their money, you never give it back.
31. Never make fun of a Ferengi's mother.
34. War is good for business.
35. Peace is good for business.
59. Free advice is seldom cheap.
112. Never have sex with the boss's sister.
217. You can't free a fish from water.
239. Never be afraid to mislabel a product.

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