William Francis Carrigan (October 22, 1883 – July 8, 1969), nicknamed "Rough", was a Major League baseball catcher. He was born in Lewiston, Maine.

Carrigan started his career as a platoon catcher and played all ten seasons with the Boston Red Sox. Midway through the 1913 baseball season, he replaced Jake Stahl as manager of the defending World Series champion Red Sox as a player-manager. He then led Boston to a second-place finish in 1914 and two world championships in 1915 and 1916, compiling an 8–2 record as a manager in World Series play. Until Terry Francona duplicated the feat in 2007, he was the only manager to have won two World Series titles with Boston. Babe Ruth called Carrigan the best manager he ever played for.

He then left baseball to become a banker in his home state of Maine. He returned to manage the Red Sox in 1927, but he was unable to duplicate his previous success as Boston finished in last place for three straight seasons. Bill Carrigan died in Lewiston, Maine, at the age of 85. He was posthumously elected to the Boston Red Sox Hall of Fame in 2004.

William Carrigan (died 1924) was an Irish canon of the diocese of Ossory and historian, during the late 19th and early 20th centuries.

William Carrigan was the youngest of 13 children. He was born in Ruthstown, Ballyfoyle, County Kilkenny. He received his childhood education in the Ballyfoyle National School and then in Wellington Square in Kilkenny City. He then attended the ecclesiastical side of St Kieran’s College. His education was continued at St. Patrick's College, Maynooth today a part of the larger NUI Maynooth. He was ordained by Francis Moran, Bishop of Ossory, in 1884. His first posting was as curate in Ballyragget in North County Kilkenny. Bishop Moran was a distinguished historian, having founded the Ossory Archaeological Society in 1872. He encouraged William’s interests in history and he joined the Ossory Archaeological Society in 1884; his first paper was printed in the last issue of the Ossory Archaeological Society in 1886.

The 19th Century saw a great interest in history. Kilkenny had already seen two major historical works written in the 1880s, John Hogan’s History of Kilkenny and P. M. Egan's Guide to Kilkenny. The clergy played an active role in these developments; the Rev. James Graves was a frequent contributor to the Kilkenny Archaeological Society. William Carrigan with his high interest in local history took these developments as reason to create his own writings. The Bishop of Ossory, Dr Brownrigg, encouraged Carrigan to begin a compilation of a history of Ossory. The Bishop would fund his travels and subscribe to the finished works.