| 2025 Six Nations Under 20s Championship |
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| Date | 30 January – 14 March 2025 |
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| Countries | |
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| Champions | France (4th title) |
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| Matches played | 15 |
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| Tries scored | 100 (6.67 per match) |
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| Top point scorer(s) | 38 – Ben Coen (England) |
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| Top try scorer(s) | 7 – Lyam Akrab (France) |
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| Official website | sixnationsrugby.com |
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The 2025 Six Nations Under 20s Championship was the 18th Six Nations Under 20s Championship, an annual northern hemisphere rugby union tournament contested by the under-20 men's national teams of England, France, Ireland, Italy, Scotland and Wales. England were the reigning champions, having won their 10th title in 2024, and went into the final day of this year's competition with a chance to win a second straight Six Nations title for the first time since 2013; however, France's 45–40 victory over Scotland in Paris meant France won their fourth Six Nations title, their first since 2018.