This is a list of parliamentary by-elections in the United Kingdom held between 1818 and 1832, with the names of the previous incumbent and the victor in the by-election. In the absence of a comprehensive and reliable source, for party and factional alignments in this period, no attempt is made to define them in this article. The House of Commons: 1790-1820 and The House of Commons: 1820-1832 provide some guidance to the complex and shifting political relationships, but those works do not define each member's allegiances.