"Shout Out to My Ex" is a song by Little Mix which serves as the lead single and appears as the first track on their fourth studio album Glory Days and as the first track on the reissued album Glory Days: The Platinum Edition.

The song debuted at #1 on the UK Singles Chart, earning the group their fourth #1 single on the chart as well as #1 on the Official Vodafone Big Top 40. It peaked at #4 on the Australian charts as well as #1 on both the Irish Singles Chart and Scottish Singles Charts and #7 on the New Zealand Single Top 100. It also debuted at #69 on the US Billboard Hot 100 Singles chart as well as #30 on the US Digital Songs chart.