O Ewigkeit, du Donnerwort, BWV 60, a dialogue cantata by Johann Sebastian Bach for Leipzig, was first performed.

O Ewigkeit, du Donnerwort, BWV 60, is a church cantata for the 24th Sunday after Trinity composed by Johann Sebastian Bach. It was first performed in Leipzig on 7 November 1723, and is part of Bach's first cantata cycle. It is one of Bach's dialogue cantatas: its topic, fear of death and hope of salvation, plays out mainly through a conversation between two allegorical figures, Fear and Hope.

Johann Sebastian Bach was a German composer and musician of the late Baroque period. He is known for his prolific output across a variety of instruments and forms, including the orchestral Brandenburg Concertos; solo instrumental works such as the cello suites and sonatas and partitas for solo violin; keyboard works such as the Goldberg Variations and The Well-Tempered Clavier; organ works such as the Schübler Chorales and the Toccata and Fugue in D minor; and choral works such as the St Matthew Passion and the Mass in B minor. Since the 19th-century Bach Revival, he has been widely regarded as one of the greatest composers in the history of Western music.