St. John's Institution (Malay: formerly known as SMK St. John; abbreviated SJI) is a public all-boys school (sixth form is co-ed) and is one of the oldest schools in Kuala Lumpur, Malaysia. The school is widely known by its initials SJI and the students of St John's Institution bear the name Johannians. SJI is among the first 30 schools selected into the Cluster School scheme when it was first introduced in 2007 by the Ministry of Education, Malaysia.