By virtue of article 70 of the Swiss Federal Constitution, Switzerland has four official languages: German, French and Italian, along with Romansh when the Confederation deals with Romansh-language citizens. This makes Romansh an official regional language, in fact.

Switzerland's linguistic landscape breaks down as follows: 57.3% Germanophones, 20.7% Francophones, 3.5% Italophones, 0.4% Romansh and 18.1% allophones (Serbo-Croatian, Portuguese, Spanish, Turkish, etc.). However, Swiss Germanophones do not speak German as a mother tongue, but rather as one of the many varieties of Schweizerdeutsch (or Schweizerdütsch), which translates as "Swiss-German" in English; yet, they always write in Standard (or High) German.

Francophones speak and write standard French, but almost 80% of Italophones speak a dialectal and very local variety of Italian (in fact different from one valley to the next, and almost incomprehensible for an Italian); others speak a regional Italian (from Tessin or Grisons), but they all write Standard Italian.

Switzerland's Romansh citizens represent 0.5% of the Swiss population, and they mostly live in the canton of Grisons, scattered in the mountains or in poor, sparsely populated communes. Their language, Romansh, is of Latin origin (like French and Italian), but it breaks down into five varieties, all intelligible to one another: Sursilvan (lower Rhine valley), Vallader (Lower Engadine), Surmiran (Sursee and Alvra valley), Sutsilvan (upper Rhine valley) and Puter (upper Engadine). Romansh's five varieties remain closely related. In 1982, the Lia Rumantscha (Romansh League) created a standard version of Romansh called Rumantsch Grischun.

In the end, one can say there is no actual "linguistic minority" in Switzerland because, at the local level, Germanophones, Francophones, Italophones and speakers of Romansh are all majorities. You have to look at the country as a whole to speak of "minorities" (French, Italian, Romansh) and of a majority (German).

Swiss constitutional law revolves around four key principles: equality among languages; citizens' freedom in matters of language use; language territoriality; and the protection of minority languages.

The principle of equality gives the confederation's three main official languages the same legal status. Freedom of expression gives Swiss citizens the right to use the language they want, but in practice, rulings handed down by federal courts have always favoured territorial rights over freedom of expression. Language territoriality, the third principle, represents the cornerstone of Swiss language policy.

Switzerland has four regions that are, in principal, unilingual (see the map): German, French, Italian and Romansh; there are no bilingual districts or regions. Even in a town or city partitioned by linguistic borders (Fribourg and Bienne), the unilingual zones remain intact and observe the boundary that Swiss citizens lightheartedly refer to as the Röstigraben, or the "roesti gate" (roesties are a sort of pan-fried potato pancake).

As a result, federal and cantonal authorities must never alter the country's recognized linguistic borders. That said, Switzerland's linguistic borders have remained intact for a thousand years. The country places the supremacy of linguistic territorial separation above all else. What's more, linguistic borders aren't drawn by the federal government, but instead by the cantons, which can occasionally delegate that power to communes (as in Grisons). Finally, under Swiss law, the fourth principle means that the Constitution guarantees the survival of all four national languages and provides the measures needed to protect the Italian and Romansh languages in particular. This raises a similarity with the Canadian model: the federal government in Canada protects all official-language minorities, regardless of the province concerned.

To summarize, again, the Swiss federal government is quadrilingual, the cantons are generally unilingual, but some are bilingual, and a single one is trilingual.

In principle, all official languages can be used at the federal parliament in Bern. Members of parliament speak in the official language of their choice. Because Germanophones form a majority in the house, German is used most often; Francophone members generally use French, while Italian members, for expediency's sake, usually rely on German or French. As for Romansh, it is rarely used, but certainly not banned.

The federal parliament has simultaneous translation services for French, German and Italian, but not for Romansh, meaning that members who use that language won't be understood by their non-Romansh colleagues. All laws are enacted and published simultaneously (with only a few exceptions) in the three major official languages (German, French and Italian). For many years now, legislation has been drafted in German, then translated into French, and finally into Italian; rarely are bills drafted in French or Italian. And though no bills are ever drafted in Romansh, some laws have been translated into that language since 1988. In Canada, laws are written at once in both English and in French; in only highly exceptional circumstances are they ever translated.

Though the Swiss federal government is nationally trilingual and regionally quadrilingual, language use differs radically from Canada's, where institutional bilingualism applies nation-wide. Switzerland instead distinguishes between the centralized federal administration in the capital of Bern, and the decentralized federal administration spread throughout the country's cantons.

The central administration is trilingual nationally (German, French, Italian): it responds in the language used by each citizen, whether written or oral. In addition, the central administration must use Romansh when addressing the entire Romansh citizenry. Here, the bilingualism (or trilingualism or quadrilingualism) policy resembles Canada's.

However, in their dealings with decentralized federal administration offices (outside the nation's capital), citizens are subject to the principle of territoriality—which differs tremendously from the administrative bilingualism practised by Canada's federal government. Switzerland's decentralized administrative offices operate solely in the language of the canton (and in both languages if the canton is bilingual). So, Francophones cannot demand French-language federal services in a Germanophone canton or city; similarly, Germanophones cannot demand German-language services in a city such as Geneva, which is French-speaking. Canada does not have this sort of decentralized federal administration.

As for the legal system in Switzerland, citizens can use their official first language in all federal courts, which are thus trilingual (and to an extent quadrilingual because they even accept documents written in Romansh and has them translated at the state's expense). But, even though cases can be tried in two languages, the federal court presents its ruling only in the language (German, French, Italian, Romansh) of the defendant, whether the case involves public law, civil law or criminal law, and regardless of the canton in which the trial takes place. Finally, education policy in Switzerland remains a cantonal jurisdiction and, as in Canada, does not come under federal jurisdiction.

In March of 2001, the federal parliament adopted a language law titled (unofficial title translation from French) Federal Act on National Languages and Harmony Among Linguistic Communities as part of its language-management policy.

In unilingual cantons, only one official language (German, Italian, French) is used in all areas of public life. Even the federal administration operates under this policy, because cantons have the power to choose their official language or languages (the Swiss federal constitution recognizes German, French and Italian as official languages of the Confederation, Romansh being an official regional language).

This also means, of course, that matters under cantonal jurisdiction take place in the canton's official language only (German: 14 cantons; French: four cantons; Italian: one canton); examples of cantonal jurisdiction are the cantonal parliament and legislation; cantonal courts; cantonal administration, schooling; the same principal applies to private-sector affairs such as commerce, employment and signage. Ultimately, then, citizens have no language choices under the unilingualism model, not even for schooling.