Mordialloc District is a metropolitan electorate located approximately 18 kilometres south-east of Melbourne, with an area of 38 square kilometres. It encompasses the suburbs of Aspendale, Aspendale Gardens, Chelsea, Chelsea Heights, Edithvale, Moorabin Airport, Mordialloc and Parkdale; along with parts of Bangholme, Cheltenham and Mentone.

The District includes suburban areas and established and developing industrial estates. Other features include a long coastal strip, Moorabin Airport and the Edithvale-Seaford Wetlands Environmental Area.