Japan national under-20 rugby union team

{{More citations needed|date=September 2014}}

{{Infobox rugby team

| country = Japan U-20

| image =

| imagesize = 150px

| union = Japan Rugby Football Union

| nickname =

| emblem =

| captain =

| coach = Keisuke Sawaki

| from =

| caps =

| top scorer =

| most tries =

| pattern_la1 = _whitelower

| pattern_b1 = _twowhitehoops

| pattern_ra1 = _whitelower

| leftarm1 = cc0000

| body1 = cc0000

| rightarm1 = cc0000

| shorts1 = 000000

| socks1 = 000000

| first = {{flagdeco|JPN}} Japan 17–53 France {{flagdeco|FRA}}
(6 June 2008)

| bigwin = {{flagdeco|JPN}} Japan 105–20 Hong Kong {{flagdeco|HKG}}
(2 July 2024)

| bigloss = {{flagicon|NZL}} New Zealand 75–0 Japan {{flagicon|JPN}}
(3 May 2015)

|World cup apps = 2 (First in 2008)

|best = 15th, 2008 & 2009

}}

The Japan national under-20 rugby union team is Japan's junior national team in rugby union.

Japan won the IRB Junior World Rugby Trophy in 2014, beating Tonga in the final 35–10. This qualified them for the 2015 IRB Junior World Championship in Italy.{{cite web | url =http://www.irb.com/jwrt/news/newsid=2071007.html#japan+junior+world+rugby+trophy | title =Japan win Junior World Rugby Trophy | author =IRB | date =19 April 2014 | access-date =3 June 2014 | archive-url =https://web.archive.org/web/20140420020022/http://www.irb.com/jwrt/news/newsid=2071007.html#japan+junior+world+rugby+trophy | archive-date =20 April 2014 | url-status =dead }} The team also competed at the Oceania U20 Championship in 2015.