Joseph Peter Gardiner (4 July 1886 – 23 January 1965) was the Labor Party member for the Western Australian Legislative Assembly seat of Roebourne from 1911 to 1915.

His sudden and still unexplained departure from Western Australia in 1915 was an important factor in the collapse of John Scaddan's Labor government.

He was educated at the Christian Brothers College in that city, and was then apprenticed to his bootmaker father in West Perth.

[2] On 31 October 1911, Gardiner was elected to the Western Australian Legislative Assembly seat of Roebourne.

When it was learned that he had left the State, Gardiner's seat was declared vacant on 30 September 1915, on the grounds of non-attendance.