平安夜(silent Night)，又称圣诞夜(Christmas Eve)，即圣诞前夕(12月24日)，在大部份基督教社会是圣诞节日庆祝节日之一。圣诞夜传统上是摆设圣诞树的日子，但随着圣诞节的庆祝活动提早开始进行，例如美国在感恩节后，不少圣诞树早在圣诞节前数星期已被摆设。
平安夜之歌 Silent Night 平安夜
Silent night, holy night!
All is calm, all is bright.
Round yon Virgin, Mother and Child.
Holy infant so tender and mild,
Sleep in heavenly peace,
Sleep in heavenly peace.
Silent night, holy night!
Shepherds quake at the sight.
Glories stream from heaven afar
Heavenly hosts sing Alleluia,
Christ the Savior is born!
Christ the Savior is born.
Silent night, holy night!