Six Nations Women's U21 Series
| Current season, competition or edition: 2026 Six Nations Women's U21 Series | |
| Formerly | Six Nations Women's U20 Summer Series (2024–2025) |
|---|---|
| Sport | Rugby union |
| Founded | 2024 |
| First season | 2024 |
| No. of teams | 6 |
| Countries | |
| Most recent champion | France (2025) |
| Most titles | France (2 titles) |
| Official website | www |
The Six Nations Women's U21 Series (formerly the Six Nations Women's U20 Summer Series) is an annual international rugby union competition featuring the under-21 women's national teams of England, France, Ireland, Italy, Scotland, and Wales. The tournament serves as a development pathway for young players progressing to senior international rugby.