The 2018 Senior Open Championship was a senior major golf championship and the 32nd Senior Open Championship, held on 26–29 July at the Old Course at St Andrews in St Andrews, Scotland.

Miguel Ángel Jiménez won by one stroke over defending champion Bernhard Langer.

The 2018 event was the first Senior Open Championship played at St Andrews.

The field of 144 competitors comprised 136 professionals and 8 amateurs.

An 18-hole stroke play qualifying round was held on Monday, 23 July for players who were not already exempt.