The Second Epistle to the Thessalonians is a book from the New Testament of the Christian Bible. It is traditionally attributed to Paul the Apostle, with Timothy as a co-author. Modern biblical scholarship is divided on whether the epistle was written by Paul; some scholars believe Paul wrote this epistle, but others reject its authenticity based on what they see as differences in style and theology between this and the First Epistle to the Thessalonians.

Timothy or Timothy of Ephesus was an early Christian evangelist and the first Christian bishop of Ephesus, who tradition relates died around the year AD 97.