List of number-one singles of 2012 (Ireland)

This is a list of singles that reached number one on the Irish Singles Chart during 2012. The chart is compiled by the Irish Recorded Music Association (IRMA) on behalf of the Irish record industry. It is based on physical and digital single sales, as well as audio streaming data, in Ireland. The chart week runs from Friday to Thursday. Each week's number-one is announced on Friday.

The information below typically includes the artist(s), the single's title, and the date the single reached the number one position. Any notable details, such as the length of time a single remained at number one, or if it was a Christmas number one, are also commonly included. The list documents the chronological order of these chart-topping singles throughout the year 2012.