Alderman Sydney Alexander Anderson (born 23 April 1949) is a former Democratic Unionist Party (DUP) politician who was an Armagh, Banbridge and Craigavon Borough Councillor for the Portadown DEA from 2019 to 2023.

He previously served as a Member of the Northern Ireland Assembly (MLA) for Upper Bann from 2010 to 2017.

Anderson resigned from the UUP ahead of the 2003 Northern Ireland Assembly election, and stood as an independent candidate in Upper Bann, polling 581 votes (1.34%).

Before the 2005 local elections, he joined the Democratic Unionist Party (DUP).

[1] In July 2010, he was co-opted to the Northern Ireland Assembly, replacing David Simpson in Upper Bann.