The letter itself states that Paul the Apostle is its author, notwithstanding attacks by liberal theologians on its authorship (along with that of the other Pastoral Epistles).
Traditionally it is considered the final book that Paul wrote before his death, based on the verbiage from II Timothy 4:6–8: "For I am now ready to be offered, and the time of my departure is at hand. I have fought a good fight, I have finished my course, I have kept the faith: Henceforth there is laid up for me a crown of righteousness, which the Lord, the righteous judge, shall give me at that day: and not to me only, but unto all them also that love his appearing." Other reasons for the traditional view of II Timothy being the final book are comments made later in the chapter, such as his recount of one time fellow-worker Demas deserting him, "having loved this present world" (4:10), and his comment that Mark was "profitable to the ministry" (4:11, in contrast to his views on Mark in Acts, which resulted in a split between him and Barnabas). It also contains the only Biblical mention of Linus (4:21), which Roman Catholic tradition claims was the immediate successor to Peter as Pope.