Reginald B. Alcock, PC (April 16, 1948 – October 14, 2011) was a Canadian politician. He represented the riding of Winnipeg South in the House of Commons of Canada from 1993 to 2006 and was a cabinet minister in the government of Prime Minister Paul Martin. Alcock was a member of the Liberal Party of Canada.
The family name Regan, along with its cognates O'Regan, O Regan, Reagan, and O'Reagan, is an Anglicized form of the Irish surname Ó Riagáin or Ó Ríogáin, from Ua Riagáin. The meaning is likely to have originated in ancient Gaelic ri "sovereign, king" and the diminutive suffix -in; thus "the king's child" or "big king". The name was borne by two distinct families: one seated in Meath, the other in Thomond.