Albert Bathurst Piddington KC (9 September 1862 – 5 June 1945) was an Australian lawyer, politician and judge.
He served on the High Court of Australia for one month in 1913, making him the shortest-serving judge in the court's history.
Piddington was born in Bathurst, New South Wales.
He studied classics at the University of Sydney, and later combined his legal studies with teaching at Sydney Boys High School.
Piddington was elected to the New South Wales Legislative Assembly in 1895, representing the Free Trade Party.
He was defeated after a single term, and subsequently returned to his legal practice, becoming one of Sydney's best-known barristers.
Piddington was sympathetic to the labour movement, and in April 1913 Andrew Fisher nominated him to the High Court as part of a court-packing attempt.
His appointment was severely criticised, and he resigned a month later without ever sitting on the bench.
Later in 1913, Piddington was made the inaugural chairman of the Inter-State Commission, serving until 1920.
He was appointed King's Counsel in 1921, and remained a public figure into his seventies.