提多书（希腊语：ΠΡΟΣ ΤΙΤΟΝ）是新约圣经中保罗书信的其中一卷，也是圣经全书的第56本书，亦是使徒保罗「教牧书信」最短的一封。

用来支持提多书真确无误的证据与用来支持同时代完成的提摩太前、后书的证据大致相同。这三封圣经书信时常被人称为保罗的“牧者之信”，其写作风格也很相似。伊里奈乌斯和奥利金两人均曾引用提多书，此外其他许多古代权威亦作证提多书属于圣经正典。西奈抄本及亚历山大抄本均含有提多书。约翰·赖兰德斯图书馆存有一份约成于公元第三世纪的纸莎草纸抄本残片(P32)，内里载有提多书1章11-15及2章3-8的经文。

The Epistle of Paul to Titus, usually referred to simply as Titus, is one of the three Pastoral Epistles (along with 1 Timothy and 2 Timothy) traditionally attributed to Paul the Apostle and is part of the New Testament. It is addressed to Titus and describes the requirements and duties of elders and bishops. Like 2 Timothy, this epistle is considered to be Paul's final instructions to early church leaders before his final departure.