Whites Flat (also known as White Flat) is a rural locality in the Eyre and Western region of South Australia, situated within the District Council of Lower Eyre Peninsula.

It also contains the Tucknott Scrub Conservation Park, which lies in its north-west corner.

[4] Whites Flat Post Office opened on 1 October 1897[5] In 1915, Whites Flat was described as consisting of a post office and local hall, the latter simultaneously serving as school, church, dance hall and lecture room, for less than a dozen inhabitants.

[6] The school survived for several decades; in 1942, air raid trenches were dug for the students.

[8] The post office at Whites Flat is long closed; however, the building, reputed to be the "smallest post office in Australia" survives, having been relocated to the National Trust of South Australia-owned Koppio Smithy Museum in adjacent Koppio.