Year 112 (CXII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Traianus and Cornelius (or, less frequently, year 865 Ab urbe condita). The denomination 112 for this year has been used after the early mediaeval period, when the Anno Dominicalendar era became the prevalent method in Europe for naming years.
- Emperor Trajan and Titus Sextius Cornelius Africanus become Roman Consul.
- Publius Cornelius Tacitus is Governor of the Roman province of Asia, Anatolia.
- Hadrian succeeds Gaius Julius Cassius Steirieus as archon of Athens.
- Salonina Matidia receives the title of Augusta.