| SMS Johor | |
| Native Name: | SMSJ |
| City: | Kluang |
| State: | Johor |
| Country: | Malaysia |
| Type: | Public boarding school Sekolah Berprestasi Tinggi |
| Affiliations: | Sekolah Berasrama Penuh Ministry of Education Malaysia |
| Founded: | 23 May 1973 |
| Principal: | Tuan Mohd. Sofian Bin Mohd. Aris |
| Free Label 1: | Abbreviation |
| Nickname: | Science Johore, SMSJ, SMSJDT, SCORE |
| Classes: | Lower Form: Malaysia, Matlamat, Merdeka, MuafakatUpper Form: Signifikan, Sinergi, Superior, Tesla (Science) |
| Houses: | Purnama, Suria, Buana, Segara |
| Grades: | Form 1 - 5 |
| Age Range: | 13 - 17 |
| Gender: | Male & Female |
| Language: | Malay, English, Mandarin, German, Arabic, Korean |
| Slogan: | Saya Mahu Sentiasa Juara |
| Motto: | BUDI KARYA BAKTI Wisdom Opus Devotion |
| Students: | approx. 600 |
| Alumni: | Sains Johor Alumni (SAJOHA) |
| Yearbook: | MERCU |
Sekolah Menengah Sains Johor (English: Johore Science Secondary School; abbreviated SMSJ), is a boarding school located in Kluang, Johor, Malaysia. Established on 23 May 1973, SMSJ is the first boarding school or Sekolah Berasrama Penuh (SBP) ever built in the state of Johor and the 16th SBP built in Malaysia under the 2nd Malaysia Plan. In 2023, the school commemorated its 50th anniversary. Widely known as Sains Johor, an alumnus of this school is known as a SAJOHA (SAins JOHor Alumni).
SMSJ was established in the year 1973 under the Second Malaysia Plan. The foundation of the construction was officiated by the Director of Education, Tun Hamdan bin Sheikh Tahir.
Students of the first batch were placed temporarily in English College Johore Bahru until the completion of the school's infrastructure in the month of April 1974. The first principal was Tuan Syed Ahmad Omar Al-Atas and since then, 13 principals have been on duty.
Situated at a mere one kilometer from Kluang, the school covers an area of 32 acres and it provides ample facilities for secondary students. From the year 1974 to 1984, the school received Form 6 students and from the year 1985 until 1989, the school carried out GCE A-Level. After that, the school maintains receiving only Form 1 to Form 5 students until now.
The main field (Padang A), was completed in 1976 and the second field (Padang B), was completed in 1988. The fields are used for various sports occasions and training .
From 1996 to 2016, the school reserved two classes for students majoring in Technical Science and three classes for students majoring in Pure Science. Since 2022, only Pure Science are offered in the school. Starting from 2023, all Form 4 students will participate in the Dual Language Programme (DLP). SCORE was named a smart school in 1999.
In 2011, the school received the Cluster School title (thanks to the school's tremendous Mathematics and hockey team achievements), and finally in 2012, the school was officially designated as one of the high performance schools in Malaysia.
| No. | From | To | Principal Name | |
|---|---|---|---|---|
| 1. | 1973 | 1974 | Tuan Syed Ahmad b. Syed Omar | |
| 2. | 1974 | 1981 | Hamzah b. Hj.Abdul Rahid, P.I.S | |
| 3. | 1982 | 1984 | Tuan Haji Abu Bakar b. sulaiman | |
| 4. | 1984 | 1985 | Abd Malik b. Ismail | |
| 5. | 1986 | 1987 | Tuan Hj. Shukor b. Md Dom, P.I.S | |
| 6. | 1987 | 1988 | Tuan Hj. Mohd Ropi b. Jahis, P.I.S | |
| 7. | 1988 | 1994 | Tuan Hj. Abu Naim b. Hj Siran, P.I.S | |
| 8. | 1994 | 1997 | Jailani b. Rusni | |
| 9. | 1997 | December 1997 | Tuan Hj. Rokhani b. Mangi | |
| 10. | April 1998 | December 1998 | Tuan Hj. Abdullah b. Idrus | |
| 11. | December 1998 | June 2001 | Tuan Hj. Umar b. Kamari | |
| 12. | June 2001 | August 2002 | Tuan Hj. Kamarudin b. Abu | |
| 13. | 2002 | 2010 | Tuan Hj. Nojumuddin b. Abd Samad | |
| 14. | 2010 | August 2013 | Tuan Hj. Idris B. Ahmad | |
| 15. | August 2013 | 2017 | Encik Ibrahim B. Omar | |
| 16. | 2018 | 2020 | Tuan Hj. Kuswandi B. Tayen | |
| 17. | 2020 | Feb 2022 | Pn Hjh Fazidah binti A. Sani | |
| 18. | Feb 2022 | March 2024 | Pn Unaizah binti Mohd Attas | |
| 19. | March 2024 | Present | Tuan Mohd. Sofian bin Mohd. Aris |
Year by year, SMSJ continues to excel in both PMR and SPM, the two major public examinations in Malaysia. The school proves itself to be worthy when it succeed to produce a high percentage of straight "A" scorers for both examinations.
The PMR record was broken in the year 2011 with a school average grade value of 1.01 placing SMSJ on the 7th place among all the other residential schools; successfully beating other elite schools and past high-achievers.
The SPM record in the other hand is still being held by the 2021 batch with a school average grade of 1.47 placing SMSJ on the 9th place among all other residential schools.