SMKSJ is a secondary school located in Seberang Jaya, Penang, Malaysia.

Seberang Jaya National Secondary School (SMKSJ) was established on 4 December 1989 starting with a total of 263 students.

In March 1990, the students were transferred to SK Seberang Jaya II, Lengkok Tenggiri.

The construction of the school was delayed for 2 years, therefore students continued to board at SK Seberang Jaya II in the afternoon session and the number of students at that time amounted to 600 people.

Change after change was created to make this school SMK Seberang Jaya progress on par with other schools under the management of several principals until today led by Tuan Hazani