List of number-one singles of 1975 (Ireland)

The following is a list of songs that reached number one on the Irish Singles Chart in 1975. The Irish Singles Chart is compiled by Irish Recorded Music Association (IRMA), reflecting sales in record stores across Ireland. The chart typically tracks physical singles and, later, digital downloads and streams. 1975 marks a specific period in the evolution of popular music and the Irish music industry, and the number one singles reflect the popular musical tastes of the Irish public during that year. The information provided in this list generally includes the artist's name, song title, and the date the song reached the number one position. Specific details about the record labels, songwriters, and duration at the top of the chart may also be included where verifiable information is available. This list is significant as it provides a historical record of the most popular songs in Ireland during 1975.