Christmas fell on a Sunday most recently in 2011 and will again be on a Sunday in the year 2016.
2016
Christmas was on a Monday in 1989, since then Christmas was on Sunday in 1994, 2000, 2005, 2011 and will be on a Sunday again in 2016.
2016
21st Century: 2005, 2011 and it will again in 2016.
twice Christmas falls on Sunday in 2016 and 2022, and it skips Sunday in 2028.
Since the turn of the century, Christmas has been on Sunday twice - once in 2005 and then again in 2011 - six years later - and due to the manoeuvring of the leap day in 2016, the next time Christmas will be on Sunday won't be in 2017 - six years later - but in 2016!
Every five, six or eleven years - we are currently (as of 2012) in the five year span, which means that Christmas of 2011 was a Sunday and due to the manoeuvring of the calendar dates in 2016 due to the leap day - Christmas will again (in 2016) be on a Sunday.
It did in 2004 and it will again in 2032, in these years Christmas jumps from Thursday to Saturday.
Roman Catholic AnswerYes, if Christmas falls on a Saturday, you must attend Mass for the Holy Day, and then again on Sunday for the Sunday. In the United States, the obligation for a Holy Day is abrogated if the Holy Day falls on Saturday only for *some* Holy Days of Obligation - Christmas is NOT one of them.
Besides this coming Christmas in 2011, the last time Christmas fell on a Sunday was in 2004.
The next year in which Christmas day will fall on a Sunday will be in 2016.