Hill Holliday (HH) is a marketing and communications agency based in Boston, Massachusetts with offices in New York City and Greenville, South Carolina.

[1][2] It is the 17th largest advertising agency in the U.S.[3] Hill Holliday was founded in Boston in 1968 as Hill, Holliday, Connors, Cosmopulos, Inc. by partners Jack Connors, Jay Hill, Steve Cosmopulos and Alan Holliday.

[4] It was acquired by IPG in 1998,[5] and sold to Attivo in 2024.

[6] The agency was named Media Magazine's full-service Agency of the Year for 2011 and 2012,[7] and is the only agency to win Adweek's Media Plan of the Year four years in a row.

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