George Augustus Chichester, 2nd Marquess of Donegall, KP (August 14, 1769) - (October 5, 1844) was an Irish nobleman. He was born at St James's, Westminster, and served for less than a year as representative in the Irish House of Commons for Carrickfergus, County Antrim, before succeeding his father as second Marquess of Donegall in 1799.

Chichester was admitted to the Irish Privy Council in 1803 and later served as Lord Lieutenant for County Donegal from 1831 until his death. He was also made a Knight of the Order of St Patrick in 1821 on the occasion of George IV's visit to Ireland.

A lifelong gambler, he died heavily in debt in 1844 at his home at Ormeau, County Antrim, and was buried in St Nicholas's Church, Carrickfergus.