In more specific usage, the epistles believed to really have been written by Paul (1 Thessalonians, Galatians, 1 Corinthians, 2 Corinthians, Philippians, Philemon and Romans) are known as Pauline Epistles to distinguish them from those known as pseudo-Pauline epistles (2 Thessalonians, Ephesians, Colossians, 1Timothy, 2 Timothy and Titus ).

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The term 'Pauline epistles' is applied to those epistles that scholars generally agree were actually written by the apostle Paul. The term 'non-Pauline epistles' is applied to those epistles that scholars generally agree were not actually written by the apostle Paul, although the authors wrote in his name. Another term for 'non-Pauline epistles' is 'pseudo-Pauline epistles'.

The epistles almost universally regarded as having been written by Paul are: Romans, 1 Corinthians, 2 Corinthians, Philemon, Galatians, Philippians and1 Thessalonians. The following epistles are regarded by the majority of scholars as non-Pauline: Ephesians, Colossians, 2 Thessalonians, 1 Timothy, 2 Timothy and Titus.