Mil-Lel is a northern suburb of Mount Gambier.

The name for this suburb is believed to be a corruption of "Mullel", the name of a nearby waterhole.

The name was historically written as two words: "Mil Lel" until the spelling was changed to "Mil-Lel" on 28 May 2009.

[1] Mil Lel Post Office opened on 1 September 1899, was downgraded to a receiving office from October 1910 until being upgraded again on 1 July 1927, and closed on 30 June 1993.

[8] Mil-Lel is located within the federal division of Barker, the state electoral district of Mount Gambier and the local government area of the District Council of Grant.