Jalan Damai Secondary School or simply SMK Jalan Damai, is a national secondary school located in Kampung Baru, Penang, Malaysia. It has about 2370 students and 120 teachers.

SMK Jalan Damai, Bukit Mertajam was founded on 5th January 1970. At that time, it was known as Sekolah Menengah Rendah, Bukit Mertajam (the Lower Secondary School, Bukit Mertajam) with a total of 717 students and 29 teachers (including a religious teacher and a principal Mr. A. Gopala Krishnan).During that time, the official buildings were still under construction, so the students had to share facilities and spaces with Sekolah Tinggi Bukit Mertajam (Bukit Mertajam High School) in the afternoon session. At the end of 1973, the new buildings (14 classrooms, 3 science labs, 2 domestic science rooms, industrial arts workshop and canteen) were completed on Jalan Damai, Bukit Mertajam. On the 7th of January 1974, 602 students moved to the new buildings.

In December 2020, SMK Jalan Damai has changed principle again. The new principle's name is Dr. Ooi Yek Hwa. He succeeded the job from Mr Lee Cheah Kuen. Mr Lee Cheak Kuen retired on December 2020. ..