or is a term informally used in Japan to refer to those firms which, collectively, are perceived to be the largest firms headquartered in Japan and distinguished in comparison to their other competitors. The following firms are seen as composing the "Big Four" (listed alphabetically):

• Anderson Mōri & Tomotsune
  Anderson Mori & Tomotsune
  is one of the "Big Four" law firms in Japan.The firm was founded in 1952 by an American attorney named James B. Anderson and was formerly named Anderson Mōri & Rabinowitz after its three American partners and changed its name to Anderson & Mōri. All the three American partners left Japan thereafter...
  
  
• Mori Hamada & Matsumoto
• Nagashima Ohno & Tsunematsu
  Nagashima Ohno & Tsunematsu
  is one of the "Big Four" law firms in Japan.The firm was "founded" in 2000 by the acquisition of Tsunematsu Yanase & Sekine by Nagashima & Ohno .The office is in Kioichō, Chiyoda, Tokyo....
  
  
• Nishimura & Asahi
  Nishimura & Asahi
  is the largest law firm in Japan and one of the "Big Four" law firms in Japan.The firm was "founded" in 2007 by the acquisition of the Kokusai Bumon　 of Asahi Law Offices by Nishimura & Partners is the largest law firm in Japan and one of the "Big Four" law firms in Japan.The firm was "founded"...
  
  

These are leading law firms in Japanese business law practices and considered to be the top tier.

Related phrases

• Magic Circle (law)
  Magic Circle (law)
  The "Magic Circle" is an informal term used to collectively describe what are generally regarded to be the five leading UK-headquartered law firms and the four or five leading London-based commercial barristers' chambers.-Law firms:...
  
  - five firms with headquarters in London
  London
  London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...
  
   regarded as the leading firms in the United Kingdom
  United Kingdom
  The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
  
  .
• Global Quartet or Big Four, referring to members of the Magic Circle other than Slaughter and May as it has, in general, not pursued a policy of expansion
• Golden Circle, a term used for example, by The Economist
  The Economist
  The Economist is an English-language weekly news and international affairs publication owned by The Economist Newspaper Ltd. and edited in offices in the City of Westminster, London, England. Continuous publication began under founder James Wilson in September 1843...
  
  , or Silver Circle
  Silver Circle (law)
  The Silver Circle is a term coined by The Lawyer magazine in 2005 to refer to a group of corporate law firms headquartered in London, United Kingdom which all fall outside of the Magic Circle and have a substantially lower turnover than the members of that group but have an average profit per...
  
  coined by The Lawyer
  The Lawyer
  The Lawyer is a weekly British magazine for commercial lawyers and corporate directors, first published in 1981. It is owned by Centaur Media plc....
  
  magazine in 2005 to describe mid-market or boutique law firms in the UK with profits per partner levels similar to those of the Magic Circle but being much smaller in terms of overall turnover
  Revenue
  In business, revenue is income that a company receives from its normal business activities, usually from the sale of goods and services to customers. In many countries, such as the United Kingdom, revenue is referred to as turnover....
  
   and numbers of lawyers
• White shoe firm
  White shoe firm
  White shoe firm is a phrase used to describe the leading professional services firms in the United States, particularly firms that have been in existence for more than a century and represent Fortune 500 companies...
  
  s or Charmed Circle, referring to law firms perceived to be the leading New York City
  New York City
  New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...
  
   law firms
• Seven Sisters
  Seven Sisters (law firms)
  The Seven Sisters refers to a collection of seven leading Canadian law firms with offices in Toronto. The term can be traced back to at least 2001, when it may have been coined by Sandra Rubin to describe the top seven Canadian law firms by mergers and acquisitions deal volume...
  
  , referring to the seven Canadian law firms considered to be the top tier
• Big Three law firms, referring to three Texas law firms considered to be the top tier
• Big Six law firms (Australia)
  Big Six law firms (Australia)
  The Big Six law firms is a term informally used in Australia to refer to those firms which, collectively, are perceived to be the largest firms headquartered in Australia and distinguished in comparison to their other competitors...
  
  , referring to six Australia largest law firms.