The 2015 by-thirds election to Preston City Council took place on 7 May 2015 as part of the United Kingdom local elections, 2015 on the same day (and in the same polling places) as the general election to elect approximately one-third of councillors for a four-year term.
Councillors elected in Preston City Council election, 2011 defended their seats this time. Each ward's election can be directly compared with the 2011 elections or indirectly compared looking at councillors' and candidates' correlations in their own party results to the Preston City Council election, 2014.
Results
All percentage changes are based on the last election for this group of Councillors, which was the 2011 Preston City Council election.
This election's effects on the composition of the council combined with the totals and percentages of votes for the third elected is as follows: