| Election Name: | 2018 Sheffield City Council election |
| Flag Image: | Coat of arms of Sheffield City Council.png |
| Type: | Parliamentary |
| Ongoing: | no |
| Party Colour: | yes |
| Previous Election: | 2016 Sheffield City Council election |
| Previous Year: | 2016 |
| Next Election: | 2019 Sheffield City Council election |
| Next Year: | 2019 |
| Seats For Election: | One third of seats (28 of 84) to Sheffield City Council |
| Majority Seats: | 43 |
| Election Date: | 3 May 2018 |
| Party1: | Labour Party (UK) |
| Seats1: | 16 |
| Seat Change1: | 4 |
| Popular Vote1: | 51,583 |
| Percentage1: | 40.3% |
| Swing1: | 1.2 |
| Party2: | Liberal Democrats (UK) |
| Seats2: | 9 |
| Seat Change2: | 3 |
| Popular Vote2: | 31,359 |
| Percentage2: | 24.5% |
| Swing2: | 3.4 |
| Party4: | Green Party of England and Wales |
| Seats4: | 3 |
| Seat Change4: | 2 |
| Popular Vote4: | 22,552 |
| Percentage4: | 17.6% |
| Swing4: | 4.2 |
| Party5: | UK Independence Party |
| Seats5: | 0 |
| Seat Change5: | 1 |
| Popular Vote5: | 3,194 |
| Percentage5: | 2.1% |
| Swing5: | 13.2 |
| Map Size: | 320px |
| Council control | |
| Posttitle: | Council control after election |
| Before Election: | Labour |
| After Election: | Labour |
Elections to Sheffield City Council took place on Thursday 3 May;[1] one of a number of local council elections taking place across England on the same day. These were the first elections since 2016; the normal practice of electing one-third of councillors every year resumed this year, after the previous staging had seen all seats up for election as a result of boundary changes. A number of by-elections had also occurred between the 2016 and 2018 elections.
| valign=top colspan="2" style="width: 100px" | Party | valign=top style="width: 126px" | Previous council | valign=top style="width: 94px" | New council | valign=top style="width: 30px" | +/- |
|---|---|---|---|---|---|---|---|
| Labour | align=center | 56 | align=center | 53 | align=center | 3 | |
| Liberal Democrats | align=center | 20 | align=center | 22 | align=center | 2 | |
| Green | align=center | 4 | align=center | 6 | align=center | 2 | |
| UKIP | align=center | 4 | align=center | 3 | align=center | 1 | |
| Total | 84 | 84 | |||||
| Working majority | |||||||
O’Rourke was a sitting councillor for City ward.