Gum Tree Gully Conservation Park is a protected area in the Australian state of South Australia located in the locality of Hindmarsh Tiers about south of the state capital of Adelaide and about south-east of Myponga.
The conservation park consists of the following land in the cadastral unit of the Hundred of Encounter Bay – Allotment 31 of Deposited Plan 79974. The name was approved by the Surveyor General of South Australia on 18 August 2009 and is derived from a gully called Gum Tree Gully whose extent includes the conservation park. As of 2018, it covered an area of .
Gum Tree Gully Conservation Park is reported as being one of the “new reserves” created as a “direct initiative” of the recovery plan for the Mount Lofty Ranges southern emu-wren (Stipiturus malachurus intermedius) which is a bird species listed as endangered under the Environment Protection and Biodiversity Conservation Act 1999.