St. Joseph's Institution (SJI) is an independent Catholic boys' secondary school in Novena, Singapore. Founded in 1852 by the De La Salle Brothers, it is the first Catholic school and the third-oldest secondary school in Singapore.
From 2013, SJI offers a dual-track education comprising the GCE Ordinary Level Programme (OP) and the Integrated Programme (IP) track. The IP track which leads to the International Baccalaureate Diploma Programme (IBDP), which integrates the four-year secondary education with a two-year IBDP, where IP students can proceed onto the two-year IBDP without the need to complete the O-level examinations at the end of their 4th year. The OP students will take their GCE 'O' level examinations at the end of their fourth year. Based on their O-level examination results, they can apply to continue the IBDP at SJI, or pursue courses at other junior colleges or polytechnics.
The school had its first IP intake at Secondary 1 and Secondary 3 in 2013 and 2014 respectively while the first IBDP intake was in 2013.
The school's current principal is Mr Justin Arul Pierre, a former cluster superintendent in the schools division, who assumed principalship in January 2022.The school's four fraternities, Fintan, Lawrence, Marcian and Michael, are named after Brother Fintan Blake, Brother Lawrence Robless, brother Marcian James Cullen and Brother Michael Noctor respectively. The school's thirteen blocks, not counting the chapel or the brothers’ quarters, are named after Julian-Nicolas Rèche, Benildus Romançon, Cyril Bertrán, the school's founder Jean-Baptiste de La Salle, Evencio Uyarra, Florencio Martín, Gabriel Drolin, Jaime Hilario Barbal, former principal Kevin Byrne, the school's first principal Liefroy Bajon, Mutien-Marie Wiaux, the Notre Dame de La Star and Salomone Leclercq.