The Abu Dhabi Investment Authority (ADIA) is a sovereign wealth fund owned by Emirate of Abu Dhabi (in United Arab Emirates) founded for the purpose of investing funds on behalf of the Government of the Emirate of Abu Dhabi. It manages the Emirate's excess oil reserves, estimated to be as much as US$500 billion. Its portfolio grows at an annual rate of about 10% compounded.

ADIA has never published how much it has in assets. In 2008, ADIA co-chaired the International Working Group of 26 sovereign wealth funds that produced the "Generally Accepted Principles and Practices of sovereign wealth funds" (known as the Santiago Principles). These principles were created to demonstrate to home and recipient countries and the international financial markets that sovereign wealth funds had robust internal frameworks and governance practices and that their investments were made only on an economic and financial basis.