Institut auf dem Rosenberg, often referred to as Rosenberg, is a private, family-run, international boarding school located in St. Gallen, Switzerland. Established in 1889 by Ulrich Schmidt, Rosenberg was originally known as Institut Dr Schmidt and gained its current name after being acquired by the Gademann family in 1944.

Owned and managed by the Gademann family, Rosenberg is among the most expensive schools in the world, maintains a strict policy of secrecy regarding the names of its alumni, and unlike most other private institutions, does not accept donations of any kind. As of 2019, it had a student body of around 300 students drawn from 48 nationalities.

The Swiss educational reformer Johann Heinrich Pestalozzi inspired the philosophy of the school and one of his quotes, "to learn to live is the goal of all education", is reflected in the motto.

Rosenberg is included in The Schools Index of the world's 150 best private schools and among top 10 international schools in Switzerland.

The Institut auf dem Rosenberg was founded in 1889 by Ulrich Schmidt and originally carried the name of the founder, Institut Dr. Schmidt. With the death of the school's founder in 1924, the school was renamed and acquired by the Gademann family in the 1944.

The school developed multiple sections due to its international character, each of which prepared students to sit different qualifications; these were Swiss, German, Italian, and Anglo-American. By the 1960s the Anglo-American section of the school typically had around 60 pupils aged between eleven and eighteen. Irrespective of country of origin, the bulk of the international students would also sit for the American SAT. During this period the staff turnover was apparently high. Milton Toubkin, an educationist who founded Southbank International School, argued the school at this time was more concerned with money than academic standards.

Bernhard Gademann, who was a pupil in the 1980s, is the fourth generation of his family to head the school, and took over after a prior career in finance and technology.

Rosenberg has a limited student body and has been described as among the more exclusive Swiss boarding schools. Families are encouraged to apply early as spaces are allocated on a first-come basis and judged on merit; although, in theory, it is possible for a new student to join after the academic year begins. Successful entry depends on passing a personal interview and an admissions exam.

Various figures have been suggested for the total enrollment. A 2019 article in the magazine Air Mail claimed 300 students from 48 different nationalities, while the South China Morning Post reported in the same year that "no more than 260" are enrolled. Other sources have repeated a lower figure of 230.

As of 2023, Rosenberg is the most expensive school in the world when both tuition and boarding costs are taken into account.

The base fee covering academic tuition, school meals and similar is CHF93,000. Additional fees for housing, extracurriculars and personal expenses amount to CHF57,000 on average. This makes for a combined cost in dollars of around $175,000 per year.

Rosenberg prepares its students for a broad range of external exams including the IGCSEs, A-Levels, Advanced Placement (AP's), the International Baccalaureate (IB) as well as the GIB DP Programme (German International Baccalaureate). Additionally, Rosenberg is an official testing centre for CEFR A1-C2 (including Cambridge, Goethe, DELF, DALF and DELE), SAT and the IELTS.

The Rosenberg International Curriculum (RIC) enables students to supplement core classes with a variety of co-curricular courses. More than 60 such courses are available, examples being Wealth Creation & Investment, The Art of Strategy & Game Theory, Biotechnology, and Applied Robotics. In a 2019 interview, Headmaster Gademann boasted that "we teach pretty much anything from international law to product design and entrepreneurship".

There is a focus on creativity and interpersonal skills alongside academic elements in general. Individual Development Plan (IDP) specialists design plans for each student.

For 2021, Rosenberg students scored an average of 38 on the IB, compared to a worldwide average of 33. It is not uncommon for students to take qualifications and courses ahead of their age group.

Some of the teaching staff were trained in the British state school sector.

The school is a member of the Swiss Federation of Private Schools (SFPS) as well as the Swiss Group of International Schools (SGIS).

Rosenberg's Kindergarten, primary education programs (Pre-School and Primary School, grades 1–5) and lower secondary education program (Middle School, grades 6–8) are accredited by the bureau for elementary school (Amt für Volksschule), department for education (Bildungsdepartement), canton of St. Gallen.

Rosenberg's upper secondary education programs (High School, grades 9–12) is not accredited by the department of education (Bildungsdepartement), canton of St. Gallen, nor by the Swiss Federal State Secretariat for Education, Research and Innovation (SERI).

Institut auf dem Rosenberg is internationally accredited by Cognia (formerly AdvancED). The school is a member of the European Council of International Schools and accredited for the International Baccalaureate (IB) - Diploma Programme.

The Rosenberg campus is 100,000m² of private parkland. Students are housed in restored art-nouveau villas according to gender and age. These feature single or double rooms with en-suite bathrooms.

One of the social highlights of the year is the Rosenberg Ball, for which pupils are coached by professionals for two months in preparation.

Owing to its location between Lake Constance and the Alpstein mountain range, Rosenberg provides the chance to ski in winter and take advantage of other outdoor activities. Ice skating, mountain biking, football, golf, swimming, volleyball and basketball are examples of the numerous sports on offer.

There is no official school uniform but a formal dress code comprising suits for boys and skirts for girls. This applies from Monday to Friday during breakfast, lunch, and academic lessons. Smart casual is acceptable at dinner and on the weekend.

The school was recognised as the "Most Prestigious International Boarding School" in 2019 by Corporate Vision Magazine.

Rosenberg alumni form a close, international network that helps them in their later careers. The school operates a "strict privacy policy" and does not confirm or deny names of current or former students, although the case of Mario J. Molina, winner of the 1995 Nobel Prize in Chemistry, is a notable exception.

Information on alumni therefore depends on either personal admission or media reports. Those known to have completed at least part of their education at Rosenberg include, in addition to the previously mentioned Molina, businessman and landowner Karl Friedrich, Prince of Hohenzollern, mathematician Walter Rudin, and the playboy photographer Gunter Sachs. The exiled Russian businessman Mikhail Khodorkovsky is said to have educated his children at Rosenberg.

The school's reluctance to discuss the names of famous former students is said to reflect a "quiet confidence" in the quality of its product. Gademann has claimed that both "Silicon Valley figures" and members of "industrial dynasties" have attended Rosenberg.

Holger Czukay, the German musician, lectured at the school from 1966 to 1967. The German writer W. G. Sebald taught for a year at the school from 1969 to 1970.

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