Andrew Inglis Clark (24 February 1848 – 14 November 1907) was an Australian founding father and co-author of the Australian Constitution; he was also an engineer, barrister, politician, electoral reformer and jurist. He initially qualified as an engineer, but he re-trained as a barrister to effectively fight for social causes which deeply concerned him. After a long political career, mostly spent as Attorney-General and briefly as Opposition Leader, he was appointed a Senior Justice of the Supreme Court of Tasmania. Despite being acknowledged as the leading expert on the Australian Constitution, he was never appointed to the High Court of Australia.

He popularised the Hare-Clark voting system, and introduced it to Tasmania. In addition Clark was a prolific author, though most of his writings were never published, rather they were circulated privately. Clark was also Vice-Chancellor of the University of Tasmania. Throughout his life, Clark was a progressive. He championed the rights of workers to organise through trades unions, universal suffrage (including women's suffrage) and the rights to a fair trial – all issues which today we take for granted, but were so radical in the 1880s that he was described as a 'communist' by the Hobart Mercury.

In one summation, "Clark was an Australian Jefferson, who, like the great American Republican, fought for Australian independence; an autonomous judiciary; a wider franchise and lower property qualifications; fairer electoral boundaries; checks and balances between the judicature, legislature and executive; modern, liberal universities; and a Commonwealth that was federal, independent and based on natural rights." Less favourably, a contemporary, J.B. Walker, privately judged him an "eloquent, impressive, dignified ... doctrinaire politician ... wanting in practical ability".

Yet he also had a rich and warm home life. He is described as "never too busy to mend a toy for a child, and his wife once wrote on hearing of his imminent return from America: 'to celebrate your return I must do something or bust'".

The Australian federal Division of Clark is named after him.

Clark was born in Hobart, Tasmania, the son of a Scottish engineer, Alexander Clark. He was educated at Hobart High School. After leaving school, he was apprenticed to his family's engineering business, becoming a qualified engineer, and finally its business manager. His father had established a highly successful engineering business, based on an iron foundry. The business was also involved with industrial design and construction of flour mills, water mills, coal mines and other substantial undertaking.

He grew to manhood during the 1860s, when the major issue, even in remote Tasmania, was the American Civil War and emancipation. This last issue had an especial resonance in Tasmania where a form of slavery, transportation, had been abolished as recently as 1853. Convicts were still a common sight for years later. As late as 1902, Clark would publicly be moved to tears when discussing slavery. Clark became fascinated by all things American.

In 1872, Clark disappointed his father by leaving to study law, becoming an articled clerk with R. P. Adams. He was called to the bar in 1877.