This is my interpretation of the song.  I know that the original 
music as written by Franz Gruber is different than this.
But this key sounds better to me and it is easier to sing by most.

Here are the chords with full lyrics, as all I have seen only have 
just the first or the first 2 verses.

Arranged for easy printing in one sheet of paper.  

Have it ready 'cause as soon as you bust out the guitar 
on Christmas Eve, grandma is going to ask for it.  
So be ready.


  G                         D7           G
  Silent Night, Holy Night, all is calm, all is bright,

  C                  G                 C              G
  'round yon virgin, mother and child, Holy infant so tender and mild,

  D7                 G               D7        G
  sleep in heavenly  peace, sleep in heavenly  peace.



  G                          D7               G
  Silent Night, Holy Night,  Shepherds quake, At the sight.
  
  C                   G              C                   G
  Glories stream from Heaven above,  Heavenly Hosts sing Alleluia,

  D7                   G     G          D7        G
  Christ the Savior is born, Christ the Savior is born!



  G                         D7          G 
  Silent night, Holy night, Son of God, Love's pure light,

  C                      G          C                   G
  radiant beams from Thy Holy face, with the dawn of re-deeming grace,

  D7                 G             D7          G
  Jesus, Lord at Thy birth, Jesus, Lord at Thy birth.

Edit #1:  I accidentally submitted before I was finished, but above is my final version.

来源：www.ultimate-guitar.com