Totness Recreation Park (formerly Totness National Parks Reserve) is a protected area in the Australian state of South Australia located within the localities of Mount Barker and Totness in the central Mount Lofty Ranges. Covering 41 hectares (101 acres) of land, the park is divided by the South Eastern Freeway and features a large dam. It was declared as a reserve in 1970 and re-designated as a recreation park in 1972. The park has no visitor facilities except for access tracks. It is the only park in the district, managed by the Department of Environment and Water, that is solely designated for recreation.

While parts of the park are dominated by pest plant species, primarily gorse and blackberry, it has native plant communities that are of conservation significance. messmate stringybark and manna gum woodlands are of particular note, being now uncommon in much of their former range across the Mount Lofty Ranges.

Totness Recreation Park is located about 25 kilometres (16 mi) south-east of the Adelaide city centre and about 2.5 kilometres (1.6 mi) north-west of the town of Mount Barker.

The park covers 41 hectares (101 acres) but is divided by the South Eastern Freeway, with 9 ha (22 acres) north of the freeway and 32 ha (79 acres) on its south. The only connection between the two sections is a 1.5-metre (5 ft) high, 100 m (328 ft) long, concrete storm water pipe that passes under the freeway. 5.8 ha (14 acres) of the park's southern section is leased for grazing, and fenced off from public access.

The park is surrounded by rural properties that are primarily used for grazing. The most prominent feature is a former railway dam in the northern section. Most of the park, and some adjacent rural properties, drain into this dam. Overflow from the dam eventually reaches the Mount Barker Creek and subsequently the Bremer River.

There are walking trails throughout the park and dirt vehicle access tracks along the boundaries. A boardwalk, constructed in 2001 in the northern section adjacent to the freeway, enables passage through boggy areas. Apart from the boardwalk there are no built structures and no facilities nor interpretive signs.

The park occupies hill slopes on the eastern side of a ridgeline. The ridge runs from the Bull Creek Range, diving the catchments of the Onkaparinga and Bremer rivers. Quartzite and sandstone rocks feature in the park's geological formations. The well-drained podsolic soils of the park are strongly leached and infertile. Soils on the slopes have low water holding capacity and are poor for root development. Soils in the bases of gullies can be deep, and wetter areas become boggy in winter.

The recreation park is classified as an IUCN Category III protected area.