Triathlon has been included in the Summer Youth Olympics since their inauguration. Unlike the Summer Olympic competition, a mixed relay is competed, in which competitors are paired across national boundaries to create evenly matched multinational teams, as part of the Youth Olympic Games' spirit of cooperation.

As of the 2018 Summer Youth Olympics.

More information Rank, Nation ...

Rank	Nation	Gold	Silver	Bronze	Total
–	Mixed-NOCs (MIX)	3	3	3	9
1	New Zealand (NZL)	2	1	0	3
2	Australia (AUS)	1	1	0	2
3	Great Britain (GBR)	1	0	0	1
	Japan (JPN)	1	0	0	1
	South Africa (RSA)	1	0	0	1
6	United States (USA)	0	2	1	3
7	Denmark (DEN)	0	1	1	2
8	Portugal (POR)	0	1	0	1
9	Austria (AUT)	0	0	1	1
	France (FRA)	0	0	1	1
	Italy (ITA)	0	0	1	1
	Switzerland (SUI)	0	0	1	1
Totals (12 entries)		9	9	9	27

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• Triathlon at the Summer Olympics