Doris "Granny D" Haddock (born Ethel Doris Rollins; January 24, 1910 – March 9, 2010) was an American political activist from New Hampshire. Haddock achieved national fame when, between the ages of 88 and 90, starting on January 1, 1999, and culminating on February 29, 2000, she walked over across the continental United States to advocate for campaign finance reform. In 2004, she ran unsuccessfully as a Democratic challenger to incumbent RepublicanJudd Gregg in the U.S. Senate election in New Hampshire. At age 94 at the time, Haddock was the oldest congressional candidate in U.S. history.
Haddock's walk across the country followed a southern route and took more than a year to complete, starting on January 1, 1999, in southern California and ending in Washington, D.C., on February 29, 2000.