Founded in 1918, Jit Sin High School (Malay: Sekolah Menengah Jenis Kebangsaan Jit Sin; simplified Chinese: 日新国民型中学; traditional Chinese: 日新國民型中學) is a co-educational Chinese vernacular secondary school in Bukit Mertajam, Penang.

The school is known nationwide as a top elite school for its excellent academic results in public examinations such as Pentaksiran Tingkatan Tiga (PT3), Penilaian Menengah Rendah (PMR) which was abolished in 2014, Sijil Pelajaran Malaysia (SPM) and Sijil Tinggi Persekolahan Malaysia (STPM) consistently every year.

Developments

Jit Sin High School (JSHS) used to share the same compound with Jit Sin Independent High School at Aston Road. In 1992, Jit Sin High School moved to a purpose-built campus in Taman Sri Rambai. Students attend classes from Form 1 to Form 6, they used to organise them into morning and afternoon sessions. Now, all forms have changed to morning session since the year 2020. Jit Sin High shares the same school anthem with Jit Sin Independent High School as well as its primary school counterparts, SJK(C) Jit Sin (A) & SJK(C) Jit Sin (B).

In October 2011, Jit Sin High School was awarded the title of Cluster School of Excellence (Sekolah Kluster Kecemerlangan), and is the first vernacular secondary school in Penang to achieve this premier status.

A new building due north to the original building was opened on 22 June 2019 for Form 5 and Form 6 students. The new building consists of 6 floors with 2 main elevators and 2 smaller elevators.