St. Louis 1 Catholic High School Surabaya
| St. Louis 1 Catholic Senior High School Surabaya Sekolah Menengah Atas Katolik St. Louis 1 Surabaya | |
|---|---|
Seal of St. Louis 1 Catholic High School | |
| Address | |
Jl. M. Jasin Polisi Istimewa 7 indonesia Surabaya, Indonesia , 60265 | |
| Coordinates | 7°16′49″S 112°44′34″E / 7.2803°S 112.7429°E |
| Information | |
| Type | Private Catholic Senior High School Hogere Burgerschool (former) |
| Motto | English: Be excellent in faith and knowledge |
| Religious affiliation(s) | Catholic Church |
| Established | 1862 (as Bijzondere Europeesche Schools) |
| Founder | Congregatio Fratrum a Sancto Aloysio Gonzaga |
| Local authority | Surabaya |
| Administrator | Agustinus Berlian Kurniaji |
| Head Master | Dra. Sri Wahjoeni Hadi S. |
| Staff | 94 (2024-25) |
| Teaching staff | 60 (2024-25) |
| Employees | 34 (2024-25) |
| Gender | Co-educational Boys (former) |
| Age range | 15–18 |
| Enrollment | 1,336 (2024-25) |
| Student to teacher ratio | 22:1 (2024-25) |
| Colour(s) | Red, blue and yellow |
| Song | Mars Sinlui |
| Mascot | Lui |
| Accreditation | A |
| National ranking | 2 |
| Newspaper | MITREKA |
| Alumni | Sinluiers |
| Website | smakstlouis1sby |
St. Louis 1 Catholic High School Surabaya, known in Indonesian as Sekolah Menengah Atas Katolik St. Louis 1 Surabaya, is a private Catholic high school in Surabaya, Indonesia. It was founded in 1862 by the Congregation of Brothers of Saint Louis Gonzaga (CSA) under the name Bijzondere Europeesche Schools, making it one of the oldest school in Indonesia. St. Louis 1 is particularly well known for its history, achievements and notable alumni.