United Parcel Service, Inc. ( ), commonly referred to as UPS, is the world's largest package delivery company. UPS delivers more than 15 million packages a day to 6.1 million customers in more than 200 countries and territories around the world. Since 2005, its operations include logistics and other transportation-related areas. It has been headquartered in Sandy Springs, Georgia, USA since 1991; headquarters had previously been located in New York City from 1930 until 1975 when it moved to Greenwich, Connecticut.

UPS is well known for its brown trucks, internally known as package cars (hence the company nickname "The Big Brown Machine"). UPS also operates its own airline based in Louisville, Kentucky.

UPS also owns The UPS Store (formerly Mail Boxes Etc.), a franchise chain which provides shipping, packaging, and copy services.