This is a list of bidding system

Bidding system

A bidding system in contract bridge is the set of agreements and understandings assigned to calls and sequences of calls used by a partnership, and includes a full description of the meaning of each treatment and convention...

s used in contract bridge . Bidding systems are characterized as belonging to one of two broadly defined categories:

• natural bidding systems and
• artificial bidding systems.

Nevertheless, each contains elements of the other given the number and variety of treatments and conventions that have been developed by bridge bidding theorists.

Natural four card majors systems

• 5-4-4-3 System
• Acol
  Acol
  Acol is the bridge bidding system that, according to The Official Encyclopedia of Bridge, is "standard in British tournament play and widely used in other parts of the world". It is named after the Acol Bridge Club, previously located on Acol Road in London NW6, where the system started to evolve...
  
  
• Baron
• CAB, acronym for Two Clubs, Ace-asking and Blackwood
• Canapé
  Canapé (bridge)
  Canapé is a bridge bidding system where the second suit bid is always longer than the first. The name Canapé refers to a small bite presented before a big meal....
  
  
• Colonial Acol
• Culbertson
• EFOS
  Efos
  Afus is a city in Buin va Miandasht District, Faridan County, Isfahan Province, Iran. At the 2006 census, its population was 3,805, in 1,045 families....
  
  , the Economical Forcing System developed by Eric Jannersten and others in Sweden in the sixties and seventies
• EHAA
  EHAA
  EHAA is a highly natural bidding system in contract bridge characterized by four-card majors, sound opening bids, undisciplined weak two-bids in all four suits and a mini notrump, usually of 10–12 high card points.-Weak two-bids:...
  
  , acronym for Every Hand An Adventure
• Four Aces Team
• Goren
• Official System
• Reith One-over-one

Natural five card majors systems

• 2/1 game forcing
  2/1 game forcing
  2/1 game forcing is a bidding system in modern contract bridge in which, after a one-level opening bid, a non-jump response in a new suit at the two level commits the partnership to bidding at least game....
  
  
• 5-5-4-2 System
• 5-5-5-1 System
• Aces Scientific
• Alpha
• Bridge World Standard
  Bridge World Standard
  Bridge World Standard is a bridge bidding system developed in 1967 and periodically updated, most recently in 2001. It is based on majority preferences of experts and readers of The Bridge World magazine....
  
  
• Eastern Scientific
• Five Card Majors
• Majeur Cinquième
• Romex
• Roth-Stone
• Kaplan-Sheinwold
  Kaplan-Sheinwold
  The Kaplan-Sheinwold bidding system was developed and popularized by Edgar Kaplan and Alfred Sheinwold during their partnership, which flourished during the 1950s and 1960s. K-S is one of many natural systems...
  
  
• Standard American
  Standard American
  Standard American is a common bidding system for the game of bridge in the United States, also widely used in the rest of the world. This system, or a slight variant, is learned first by most beginners in the U.S. and may be referred to as 'Goren'; a dominant version used in on-line computer...
  
  
• Western Scientific

Strong club systems

• Blue Team Club
  Blue Club
  Blue Club is a bridge bidding system, developed mainly by Benito Garozzo. It was used by the famous Blue Team and became very popular in the 1960s and has been in decline since.The main features are:...
  
  
• Black Club
• Canary Club
• Carrot Club
  Carrot Club
  Carrot Club is a strong club system, developed in the 1970s and played in international teams championships by Anders Morath and Sven-Olof Flodquist...
  
  
• French Club
• Icelandic Precision
• Moscito
  Moscito
  Moscito is a bidding or bridge system of the game of contract bridge invented by the Australian expert Paul Marston in the mid-1980s...
  
  
• Neopolitan Club
• Nottingham Club
• Power Precision Club
• Precision Club
  Precision club
  Precision Club is a bidding system in the game of contract bridge. It is a type of strong club system that was invented by C. C. Wei and used to good effect by Taiwan teams in the early 1970s...
  
  
• Schenken Big Club
• Simplified Precision
• Super Precision Club
• Ultimate Club
• Vanderbilt Club

Artificial One Club systems

• Beta
• Bissell
• Lea System
• Little Roman Club
• Polish Club
• Power Club
• Roman
• Swedish Club
• Trefle Squeeze
• Vienna

Strong Diamond systems

• Big Diamond
• Magic Diamond
• Leghorn Diamond (Livorno)

Weak Opening systems

• Carrotti
• Delta
• No Name
• Regres
• Säffle Spade
  Säffle Spade
  In the game of contract bridge, Säffle Spade is a forcing pass system developed by Einar Bergh and Pontus Svinhufvud...
  
  , a forcing Pass system

Artificial systems

• HUM Systems
  Highly unusual method
  Highly unusual methods is a class of contract bridge bidding systems defined by the World Bridge Federation. Usually these are artificial systems that require advance preparation to contend with, and are restricted to the highest levels of tournament play in most locations...
  
  
• Little Major
  Little Major
  The Little Major is a bridge bidding system devised primarily by Terence Reese.The concept for "the Little Major was born" late in 1962 while Reese was en route to a tournament in the Canary Islands with Boris Schapiro...
  
  
• Marmic
• Relay Systems

Other systems

• Amsterdam Club
• Bangkok Club
• Churchill Style
• Crane
• Dutch Spade
• Kamikaze Notrump
• Monaco
• New South Wales
• Orange Club
• Pro System
• Simplified Club
• Sims
• Stone Age Acol With Pakistani Preempts
• Symmetric Relay
• Ultimate Club
• Walsh
• Winslow