This is a list of players, past and present, who have been capped by their country in international football whilst playing for Celtic Football Club. As well as Scotland, 46 other nations have fielded Celtic players in their international sides.
<small> On the partitioning of Ireland in 1922, the Dublin-based FAI were formed and fielded a separate international side from the already established Belfast run (IFA) Ireland international side. Up until 1953 both sides claimed to represent all of Ireland, at which point FIFA ruled that neither side could call themselves "Ireland"; instead, the FAI side were named "Republic of Ireland" whilst the IFA side were named "Northern Ireland". Several players had been capped by both international sides following partition, until 1950 when FIFA intervened and ruled that players could no longer do this.</small>
<small> From 1882 to 1921 Ireland were an "All Ireland" side. On the partitioning of Ireland in 1920 they continued to play as Ireland (IFA) alongside the newly formed Dublin-based Irish Free State side. Up until 1953 both sides claimed to represent all of Ireland, at which point FIFA ruled that neither side could call themselves "Ireland"; instead, the IFA side were named "Northern Ireland" whilst the FAI side were named "Republic of Ireland". Several players were capped by both international sides following partition, until 1950 when FIFA intervened and ruled that players could no longer do this.</small>
Appearances correct as of 16 November 2021