Sydney Cuthbert Johnston (14 November 1900 – 10 May 1963) was a New Zealand accountant and diplomat.
He was educated at Auckland University College and did legal training from 1931 until 1934 when he became a public accountant.
In 1952 he was appointed a trustee of the Auckland Savings Bank in 1952 and was its president from 1959 until 1960.
[1] In 1961, Johnston was appointed New Zealand High Commissioner to Australia serving until 1963.
[2] Johnston died at his desk of a heart attack in 1963 in Canberra, aged 62.