The 2015 by-thirds election to Preston City Council took place on 7 May 2015 as part of the 2015 United Kingdom local elections 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.[1][2]
Councillors elected in 2011 Preston City Council election 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 2014 Preston City Council election.