Bi-Lo was an Australian discount supermarket chain owned by Wesfarmers. Once a chain of 180 outlets, Bi-Lo stores were progressively re-branded as Coles Supermarkets from 2006, or closed. On 30 June 2017, the final store in Shailer Park, Queensland closed.

Bi-Lo was established by John, Peter and David Weeks in South Australia in 1979. The first stores opened at Stirling and Aldgate in South Australia's Adelaide Hills region after being converted from hardware outlets, followed by the acquisition of a third store at Murray Bridge. Coles Myer cited that by 1979, Bi-Lo was South Australia's cheapest grocer.

Bi-Lo was a leader in adopting new technology and by 1983 operated product scanning systems in all stores, the first grocery chain store in Australia to complete scanning across all stores in the group.

By 1987, Bi-Lo was operating 28 supermarkets in South Australia and generating one third of metropolitan Adelaide’s supermarket sales, when it was acquired by Coles Myer, which also purchased the 34-store Shoeys discount supermarket chain in New South Wales (subsequently renamed as Bi-Lo). Bi-Lo later expanded into Queensland and Victoria.

In December 1994, Bi-Lo opened its first Mega Fresh store at Greenacres, South Australia, in response to its then chief competitor Franklins "Big Fresh" concept. In 1996, Bi-Lo acquired six Newmart supermarkets in Western Australia although the Newmart name was retained due to its strong brand identification and the existence of an unrelated chain of the same name. In 1998, Bi-Lo purchased three Northern Territory supermarkets in Darwin and Alice Springs.

Bi-Lo/Newmart opened nine new stores and completed 23 refurbishments in 2000, and opened 26 more stores and completed 11 refurbishments in 2001. The last Newmart stores in Western Australia to open before the chain was absorbed into Coles Supermarkets were at Garden City, Booragoon (October 2000) and Ocean Keys, Clarkson (July 2001). Newmart Stores in Garden City, Collie, Stirling Central, Noranda and Ocean Keys became an Action Supermarkets outlet at the same time, then became a Woolworths outlet.

In 2002, Bi-Lo acquired and converted 15 Franklins sites, in New South Wales (Warilla Grove, Campbelltown - now Coles, Hillsdale - closed 2003, Mount Druitt - closed 2005, Shellharbour, Lavington, Thirroul), Queensland (Kawana, Capalaba - Closed 2007 reopened as Coles 2008, Hope Island, Loganholme), Victoria (Southland, Waverley Gardens - closed 2004, Lalor, Broadmeadows) and South Australia (Unley - closed 2005). Around 820 former Franklins employees were offered positions at Bi-Lo. Bi-Lo also opened 7 stores and a Bi-Lo Discount Petrol site at Narrandera, New South Wales. In August of that year, all Newmart Supermarkets operated by Bi-Lo in Western Australia were transferred to the management of Coles Supermarkets. One Newmart Supermarket located in Bentley, Western Australia was rebadged as Coles, subsequently closing in September 2017.

In 2003, Bi-Lo relaunched with the slogan "Why Pay More".