The 2000 presidential campaign of Orrin Hatch, a U.S. senator from Utah, officially began on July 1, 1999, with the establishment of an exploratory committee. Hatch had been a senator since 1977 and at the time of his announcement he was a high-ranking official on several Senate committees, most notably the chairman for the Senate Judiciary Committee. He had established himself as a conservative Republican who was known to work with liberal Democrats on major bipartisan bills, such as the 1997 Children's Health Insurance Program bill. From the beginning of his campaign, Hatch stressed his experience in federal government and attacked the perceived lack of experience of the Republican frontrunner, Texas governor George W. Bush. However, numerous commentators noted that Hatch's campaign was unlikely to succeed, due to his late entry into the race and Bush's dominant position in fundraising and opinion polling. Throughout his campaign, Hatch struggled to raise money and consistently polled in the single digits. In January 2000, he came in last place in the Iowa caucuses and announced on January 26 that he was ending his campaign, supporting eventual nominee Bush, who would go on to win the 2000 United States presidential election. Hatch remained in the Senate for several more years following his campaign and in 2015, as the most senior member of the Senate, he became the president pro tempore. In 2019, he decided to retire, ending his 42-year career as the most senior Republican senator ever before dying in 2022.

Orrin Grant Hatch was an American attorney and politician who served as a United States senator from Utah from 1977 to 2019. Hatch's 42-year Senate tenure made him the longest-serving Republican U.S. senator in history, overtaking Ted Stevens, until Chuck Grassley surpassed him in 2023.