Sydney John Kearney (18 August 1870 – 16 April 1923) was an Australian politician.
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Born in Sydney to solicitor Timothy John Kearney and Sarah Margaret Trim, he attended New England Grammar School and St Joseph's College, after which he was articled as a clerk to his father in 1889. In 1894 he was admitted as a solicitor, partnering with his father until the latter's retirement in 1896, when he became a land agent; he was also secretary of the Armidale Federation League in 1899. On 10 May 1903 he married Harriet Johannah Hughes, with whom he had six children. From 1904 he was a member of the Farmers' and Settlers' Association, and at the 1903 Armidale by-election he was elected as a Liberal member of the New South Wales Legislative Assembly, holding the seat at the 1904 election.[1] In 1907 he was dropped as a candidate, but in 1908 he became an alderman at Armidale, serving as mayor in 1913.[2] He left the council in 1917. Kearney later joined the Labor Party and was secretary of the Armidale Non-Conscription League in 1917; he contested the federal seat of New England for Labor in 1922. Kearney died at Armidale in 1923.[3]