Here's a sampling of some of Luther's Christmas sermons I have bookmarked:
Luther's Christmas Sermons Epistles by J.N Lenker
Martin Luther's Christmas Book By Roland H. Bainton
Sermon for the First Sunday in Advent, Matthew 21:1-9 -- Christ's Advent into Jerusalem
Sermon for the Second Sunday in Advent, Luke 21:25-36 -- The Signs of Christ's Second Coming
Sermon for the Third Sunday in Advent, Matthew 11:2-10 -- a marvelous sermon with a great section on the distinction between Law and Gospel.
Sermon for the Fourth Sunday in Advent, John 1:19-28 -- John the Baptist's confession and the true preacher.
Sermon for the First Sunday in Advent, Romans 13:11-14 -- An Exhortation to Good Works
Sermon for the Second Sunday in Advent, Romans 15:4-13 -- An Exhortation to Bear with the Weak
Sermon for the Third Sunday in Advent, 1 Corinthians 4:1-5 - A sermon on the Office of the Ministry
Sermon for the Fourth Sunday in Advent, Philippians 4:4-7 - A sermon on Christian living; "on how to let God be everything to us"; with sections on true Christian freedom, rejoicing, and prayer.
Sermon for the Principal Christmas Service, John 1:1-14 -- Christ's Titles of Honor and His Attributes
Sermon for the Early Christmas Day Service, Luke 2:15-20 -- A sermon on the power and fruit of the Word of God
Sermon for Christmas Day, Luke 2:1-14 -- One of Luther's most famous sermons.
Sermon for Christmas Eve, Titus 2:11-14 -- Luther at his best
Second Sermon for Christmas Day, Titus 3:4-8 -- Statements on grace, faith, good works, and Baptism
Sermon for the Sunday after Christmas, Luke 2:33-40 -- On Simeon and Anna
Sermon for the Sunday after Christmas, Galatians 4:1-7 -- The People of Law and Grace; a great sermon that presents the true understanding of justification by faith and the function of the Law; Of interest to the JDDJ debate is this quote: "Note, Paul everywhere teaches justification, not by works, but solely by faith; and not as a process, but instantaneous. The testament includes in itself everything--justification, salvation, the inheritance and great blessing. Through faith it is instantaneously enjoyed, not in part, but all" (par. 37).
Sermon on the Afternoon of Christmas Day Luke 2:1-14, December 25, 1530
The Story of Jesus' Birth: A Sermon by Martin Luther- The great theologian's powerful reimagining of the Christmas story.
“To Us a Child Is Born”: Sermon on Isaiah 9:6 (PDF)