Asa Buchanan (born Asa Jeb Stuart Buchanan) is a fictional character on the ABC soap opera One Life to Live. The father of the newly-arrived characters Clint and Bo Buchanan, Asa was originated in 1980 by Phil Carey. Over two decades later, Carey turned down the show's offer to place him on recurring status in 2007, and his final appearance as Asa was on April 26, 2007.

The character subsequently died offscreen in August 2007, coinciding with the series' 10,000th episode celebration, which brought back characters from the show's past to attend the funeral. In November 2007, Carey briefly reprised the role for three episodes in Asa's videotaped will, airing November 9 to November 13, 2007. On July 16, 2008, Carey appeared as Asa's ghost, and also returned on July 21, 2008 for the series' 40th anniversary, as character Viki Davidson visits Heaven.

Beginning in the same episode, Robert S. Woods appears as a young Asa in a storyline in which the characters Bo and Rex find themselves in 1968. Carey returned on August 19, 2008 as Asa's ghost, who appears to Bo.

Brian Victor Johnson took over the role of the young Asa from August 22, 2008 to August 25, 2008 after Bo is transported back to 2008. Carey appeared yet again on December 29, 2008, in a videotaped message recorded by Asa before his death. The patriarch of the Buchanan family, Asa is a self-made billionaire (having purchased his first oil well at age 22) and former Chief Executive Officer of Buchanan Enterprises (casually called "B.E." by the family).

Born and raised in Texas, Buchanan moves the headquarters of his company to Llanview, Pennsylvania in 1980 to stay close to his sons. Over the next two decades, Asa's ruthless business dealings and attempts to both protect and control his family members drive much of the drama in the series. In 1999, it is revealed that Asa's on-again off-again wife Renee Divine had conceived a son by Asa when they had been involved in their youth, and had put the boy up for adoption.

Max Holden poses as the missing heir, but Asa and Renee's real son turns out to be Ben Davidson, adopted brother of Sam Rappaport and love interest of Asa's former daughter-in-law Viki Carpenter.

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