Rilli Island Conservation Park is a protected area in the Australian state of South Australia located on the Riverland in the gazetted locality of Loxton North about 6.5 kilometres (4.0 mi) north-east of the Loxton town centre.

[1] The conservation park is located on Rilli Island in the Murray River adjacent to sections 63 and 64 in the cadastral unit of the Hundred of Gordon.

In 1980, it was described as follows: [6]A small, attractive island in the Murray River adjacent to Katarapko Game Reserve.

Vegetation consists of Eucalyptus camaldulensis open forest over Phragmites australis reed beds and Muehlenbeckia cunninghamii.As of 1994, it and the Kapunda Island and Media Island conservation parks have been managed in conjunction with the Murray River National Park.

[7] The conservation park is classified as an IUCN Category III protected area.