MinterEllison is a multinational law firm, and professional services firm, based in Australia. The firm has fourteen offices and operates in five countries. By number of lawyers it is the largest law firm in Australia.
 MinterEllison is considered a leading law firm, known as one of the Big Six law firms in Australia.
 The firm's origins trace back to Minter, Simpson & Co, founded in 1827, and Perkins, Stevenson & Linton, founded in 1853. Its first international office was London in 1974. Its ties to China began in the 1980s.
 In 1984 Minter, Simpson and Co and Perkins, Stevenson & Linton merged to form Minter Simpson. In 1986, Ellison Hewison & Whitehead merged with Gillotts and with Minter Simpson to become Minter Ellison. In October 1992, Minter Ellison and Morris Fletcher & Cross merged to form Minter Ellison Morris Fletcher, the fourth largest law firm in Australia. 
 The firm established offices in Hong Kong in 2000, Shanghai in 2001, and Beijing in 2010.
 In 2015, MinterEllison moved into new premises at the Governor Macquarie Tower in Sydney and Collins Arch in Melbourne.
 In March 2015, the firm dropped "lawyers" from its name. This was part of a strategy of diversification into non-legal professional services such as consulting and project management. Then Chief Executive Tony Harrington said these changes were aimed at adapting to "phenomenal change in the market... (including) increased in-house capacity at clients, and ever-consolidating larger businesses."
 In April 2016, it launched an alternative cost contract service called 'Flex'. In October 2016, it announced an expansion into non-legal consulting.
 The firm acquired ITNewcom, a boutique technology consulting firm on 1 July 2017.
 The firm performed 37 hours of pro bono work per employed lawyer in 2018. It provides pro bono legal assistance through bodies including Justice Connect, QPILCH, Public Interest Advocacy Centre, ACT Pro Bono Clearing House and the Law Society of Western Australia. It participates in the New South Wales Expert Advice Exchange, and a number of social enterprises including the Mwembe Foundation, the FOCUS women's leadership program and the Third Link Growth Fund.
 Pro bono work at Australian firms is done for reasons of goodwill, marketing, and to maintain eligibility for tenders of work on the Commonwealth panel. The firm exceeds its panel requirements for pro bono work.
 Recent awards won by MinterEllison include:
 The firm has worked on the long-term leasing of the ports of Brisbane, Darwin, Newcastle, Botany and Kembla, and, most recently in 2016 the Port of Melbourne which was leased for 50 years for $9.7 billion; the A$1.14 billion joint takeover of Aquila Resources Limited by Boasteel Resources Australia Pty Ltd and Aurizon Operations Limited; and the sale by Lloyds Banking Group plc of its Australian asset finance business, Capital Finance Australia Ltd (CFAL), and its corporate loan portfolio, BOS International Australia Ltd (BOSI), to Westpac Banking Corporation for approximately A$1.55 billion in total.
 MinterEllison has been criticised for its treatment of women. In 2021, the firm was subject to negative publicity following the resignation of CEO Annette Kimmitt. Kimmitt's position was deemed 'untenable', after she sent an email to staff criticising a senior partner for advising then Attorney-General of Australia Christian Porter.
In 2022, Western Australia's Corruption and Crime Commission alleged that the employees of the Department of Communities (Western Australia) disclosed competitors' pricing information and manipulated tender processes to benefit law firm MinterEllison in exchange for corporate box tennis tickets and spa vouchers.