The eastern long-necked turtle (Chelodina longicollis) is an east Australian species of snake-necked turtle that inhabits a wide variety of water bodies and is an opportunistic feeder. It is a side-necked turtle (Pleurodire), meaning that it bends its head sideways into its shell rather than pulling it directly back.

The species is found throughout south-eastern Australia where it is found west of Adelaide (South Australia) eastwards throughout Victoria and New South Wales, and northwards to the Fitzroy River of Queensland. Where these turtles come in contact with Chelodina canni they freely hybridise, exhibiting hybrid vigour in the Styx River Drainage of Queensland.

The carapace is generally black in color, though some may be brown. It is broad and flattened with a deep medial groove. The scutes are edged in black in those individuals with a lighter background color. The plastron is also very broad and is cream to yellow in color with sutures edged in black. The neck is long and narrow, typical of the subgenus Chelodina, and reaches a length of approximately 60% of the carapace length.

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