The 2010 Six Nations Under 20s Championship was a rugby union competition held between February and March 2010.

Ireland won the tournament and the Triple Crown but no team won the Grand Slam.

[1] Hudson, Conway (both IRE), Fish (WAL) – 4 tries Spence (IRE), Phillips, Loxton (both WAL) – 3 tries Marler, May, Watson (all ENG), Bales, Dupont (both FRA), Brown (SCO) – 2 tries