Austin Abbott (December 18, 1831 – April 19, 1896) was an American lawyer and academic.

He is probably best remembered as being the government counsel in the trial of Charles J. Guiteau for the assassination of President James Garfield.

He aided his brother Benjamin in the preparation of his well-known digests of laws and was himself a prolific legal author.

In 1875, he gained a national reputation as counsel for Henry Ward Beecher in Theodore Tilton's suit against him.

From 1891 until his death he was Dean of the Law School of the New York University, and the professor of pleading, equity, and evidence there as well.