The Ferengi Rules of Acquisition

1	Once you have their money, you never give it back.	Rom	The Nagus
1	If they want their money back, give it to them.	Quark	Prophet Motive
3	Never spend more for an acquisition than you have to.	Quark	The Maquis, Part II
6	Never allow family to stand in the way of opportunity.	Zek	The Nagus
6	A man is only worth the sum of his possessions.	Krem	Enterprise: Acquisition
7	Keep your ears open.	Odo	Hands of the Prophet
8	Only a fool passes up a business opportunity.	Vung, DS9 Novel #7	Warchild (p174)	Non-Canon
8	Small print leads to large risk.		ST:DS9 TFRoA (p6)	Non-Canon
9	Opportunity plus instinct equals profit.	Nog	The Storyteller
10	Greed is eternal.	Quark	Prophet Motive
10	Greed is dead.	Rom	Prophet Motive
13	Anything worth doing is worth doing for money.		From The Making of Star Trek: Deep Space Nine (p27) and ST:DS9 TFRoA (p9)	Non-Canon
16	A deal is a deal (...until a better one comes along.)	Quark	Melora ST:DS9 TFRoA (p10)	Add on is Non-Canon
17	A contract is a contract is a contract. But only between Ferengi.	Rom	Body Parts
18	A Ferengi without profit is no Ferengi at all.	Sisko & Nog	Heart of Stone
19	Satisfaction is not guaranteed.		ST:DS9 TFRoA (p12)	Non-Canon
21	Never place friendship above profit.	Quark	Rules of Acquisition
21	Never place profit before friendship.	Rom	Prophet Motive
22	A wise man can hear profit in the wind.	Pel	Rules of Acquisition
22	Latinum tarnishes, but family is forever.	Rom	Prophet Motive
23	Nothing is more important than your health. Except for money.	Ulis	Enterprise: Acquisition
23	Money can never replace dignity.	Rom	Prophet Motive
27	There's nothing more dangerous than an honest businessman.		ST: DS9 TFRoA (p16)	Non-Canon
31	Never make fun of a Ferengi's mother (...insult something he cares about instead.)	Quark	The Siege ST:DS9 TFRoA (p17)	Add on is Non-Canon
33	It never hurts to suck up to the boss.	Quark & Pel	Rules of Acquisition
34	War is good for business.	Dax & Quark	Destiny
35	Peace is good for business.	Dax & Quark	Destiny
40	She can touch your lobes but never your latinum.		ST:DS9 TFRoA (p23)	Non-Canon
41	Profit is its own reward.		ST:DS9 TFRoA (p24)	Non-Canon
44	Never confuse wisdom with luck.		ST:DS9 TFRoA (p25)	Non-Canon
45	Expand, or die.	Krem	Enterprise: Acquisition
47	Never trust anyone whose suit is nicer than your own.	Quark	Rivals
48	The bigger the smile, the sharper the knife.	Pel	Rules of Acquisition
52	Never ask when you can take.		ST:DS9 TFRoA (p28)	Non-Canon
57	Good customers are as rare as latinum, treasure them.	Quark	Armageddon Game
58	There is no substitute for success.		ST:DS9 TFRoA (p30)	Non-Canon
59	Free advice is seldom cheap.	Quark	Rules of Acquisition
60	Let's you and him fight.	Tunk, TNG Novel #33	Balance of Power (p87)	Non-Canon
60	Keep your lies consistent.		ST:DS9 TFRoA (p33)	Non-Canon
62	The riskier the road, the greater the profit.	Pel	Rules of Acquisition
65	Win or lose, there's always Huyperian beetle snuff.		ST:DS9 TFRoA (p36)	Non-Canon
69	Ferengi are not responsible for the stupidity of other races.	Tunk, TNG Novel #33	Balance of Power (p179)	Non-Canon
74	Knowledge equals profit.	Barclay hologram	ST:VOY Inside Man
75	Home is where the heart is, but the stars are made of latinum.	Quark	Civil Defense
76	Every once in a while declare peace. It confuses the hell out of your enemies.	Quark	The Homecoming
79	Beware of the Vulcan greed for knowledge.		ST:DS9 TFRoA (p41)	Non-Canon
82	The flimsier the product, the higher the price.		ST:DS9 TFRoA (p42)	Non-Canon
85	Never let the competition know what you're thinking.		ST:DS9 TFRoA (p43)	Non-Canon
89	Ask not what your profits can do for you, ask what you can do for your profits.		ST:DS9 TFRoA (p44)	Non-Canon
94	Females and finances don't mix.		ST:DS9 TFRoA (p46)	Non-Canon
97	Enough...is never enough.		ST:DS9 TFRoA (p47)	Non-Canon
99	Trust is the biggest liability of all.		ST:DS9 TFRoA (p47)	Non-Canon
102	Nature decays, but latinum lasts forever.	Quark & Nog	The Jem'Hadar
103	Sleep can interfere .... [cut off]	Pel	Rules of Acquisition
104	Faith moves mountains...of inventory.		ST:DS9 TFRoA (p50)	Non-Canon
106	There is no honor in poverty.		ST:DS9 TFRoA (p51)	Non-Canon
109	Dignity and an empty sack is worth the sack.	Quark	Rivals
111	Treat people in your debt like family, exploit them.	Sisko	Past Tense, Part I
112	Never have sex with the boss' sister.	Quark	Playing God
113	Always have sex with the boss.		ST:DS9 TFRoA (p56)	Non-Canon
121	Everything is for sale, including friendship.		ST:DS9 TFRoA (p58)	Non-Canon
123	Even a blind man can recognize the glow of latinum.		ST:DS9 TFRoA (p59)	Non-Canon
139	Wives serve, brothers inherit.	Odo	Necessary Evil
141	Only fools pay retail.		ST:DS9 TFRoA (p61)	Non-Canon
144	There's nothing wrong with charity...as long as it winds up in your pocket.		ST:DS9 TFRoA (p62)	Non-Canon
153	Sell the sizzle, not the steak.	Quark	ST: DS9 Comic #22	Non-Canon
162	Even in the worst of times someone turns a profit.		ST:DS9 TFRoA (p63)	Non-Canon
177	Know your enemies...but do business with them always.		ST:DS9 TFRoA (p64)	Non-Canon
181	Not even dishonesty can tarnish the shine of profit.		ST:DS9 TFRoA (p65)	Non-Canon
184	(See 191)
189	Let others keep their reputation. You keep their money.		ST:DS9 TFRoA (p66)	Non-Canon
190	Hear all, trust nothing.	Nog	Call to Arms
191	A Ferengi waits to bid until his opponents have exhausted themselves.	Tunk, Novel #33	Balance of Power (p157)	Tunk was corrected as to the number of this RofA as being 184 Non-Canon
192	Never cheat a Klingon...unless you're sure you can get away with it.		ST:DS9 TFRoA (p67)	Non-Canon
194	It's always good business to know about new customers before they walk in your door.	Quark	Whispers	Quark wasn't sure of the number of this one
202	The justification of profit is profit.		ST:DS9 TFRoA (p69)	Non-Canon
203	New customers are like razor toothed gree worms, they can be succulent, but sometimes they bite back.	Rom	Little Green Men
211	Employees are the rungs on the ladder to success. Don't hesitate to step on them.	Frool	The Bar Association
214	Never begin a business negotiation on an empty stomach.	Quark	The Maquis, Part I
216	Never gamble with an empath.	Quark, DS9 Novel #12	The Laertian Gamble (p7)	Non-Canon
217	You can't free a fish from water.	Quark	Past Tense, Part I
218	Sometimes what you get free costs entirely too much.	Quark	ST: DS9 Comic #12	Non-Canon
218	Always know what you're buying.		ST:DS9 TFRoA (p71)	Non-Canon
219	Possession is eleven-tenths of the law.	Tunk, TNG Novel #33	Balance of Power (p67)	Non-Canon
223	Beware the man who doesn't make time for oo-mox.		ST:DS9 TFRoA (p72)	Non-Canon
229	Latinum lasts longer than lust.		ST:DS9 TFRoA (p74)	Non-Canon
236	You can't buy fate.		ST:DS9 TFRoA (p75)	Non-Canon
239	Never be afraid to mislabel a product.	Gint (during Quark's dream)	Body Parts
242	More is good...all is better.		ST:DS9 TFRoA (p76)	Non-Canon
255	A wife is a luxury...a smart accountant a necessity.		ST:DS9 TFRoA (p77)	Non-Canon
261	A wealthy man can afford anything except a conscience.		ST:DS9 TFRoA (p78)	Non-Canon
263	Never allow doubt to tarnish your lust for latinum.	Rom	The Bar Association
266	When in doubt, lie.		ST:DS9 TFRoA (p79)	Non-Canon
284	Deep down everyone's a Ferengi.		ST:DS9 TFRoA (p80)	Non-Canon
285	No good deed ever goes unpunished.	Quark	The Collaborator
285	A good deed is its own reward.	Rom	Prophet Motive
286	When Morn leaves, it's all over.	Quark	The House of Quark	This rule doesn't really exist, Quark made it up.

NOTES

In the TNG episode "Bloodlines", Cmdr. Riker mentions that the Ferengi government is debating an amendment to the Rules of Acquisition. (stardate 47829.1)
We know from Quark (The Maquis, Part I) and from Pel, (Rules of Acquisition) that there are 285 Rules of Acquisition. Except that during the time of Enterprise, before ST:DS9, Krem says that there are 173 rules.
Quark mentioned rule #223 in "Profit and Loss".
Pel may have invented what she said for rule #103.
It seems that Quark violated rule #112 when he was younger.
All rule numbers marked in italics indicates that the rule is one of the Grand Nagus' revised rules in "Prophet Motive". These revised rules were never officially released.
Some of the rules listed here are "non-canon" meaning that they are not official (i.e. from the TV series). These rules come from both TNG & DS9 comic books and paperbacks. They are listed here however, because they seem to fit.
Pocket Books printed a book called "The Ferengi Rules of Acquisition" which included most of the rules from the series & added many more...almost one-quarter of the rules have now been "uncovered." Those rules from the series were not documented from this book as well, only the "non-canon" ones.
Some rules have been listed with duplicate numbers. This is not a mis-print. Both of the two sources have the same number rule. In all cases, both sources have been non-canon. So, both rules & sources have been listed for completeness.

Info on this page originally posted on http://www.vidiot.com/st-ds9/rules.html; also compiled from news posting by Michael J. Baker.