Saint-Oyens is a municipality in the Swiss canton of Vaud located at the foot of the Jura mountains.

Saint-Oyens is first mentioned in 1139 as Sancto Eugendo (Medieval Latin for Saint Eugendus).

[3] By the 13th Century the church of Saint Oyens was first mentioned and it was totally rebuilt during 1877-78.

Saint-Oyens has an area, as of 2009[update], of 3.05 square kilometers (1.18 sq mi).

[5] The municipality is located between the vineyards of La Côte and the Jura Mountains.

The blazon of the municipal coat of arms is Gules, in Chief Or an Eagle Sable.

[9] Most of the population (as of 2000[update]) speaks French (214 or 90.3%), with German being second most common (9 or 3.8%) and English being third (8 or 3.4%).

[8] The age distribution, as of 2009[update], in Saint-Oyens is; 36 children or 11.7% of the population are between 0 and 9 years old and 42 teenagers or 13.6% are between 10 and 19.

[9] The historical population is given in the following chart:[3][13] In the 2007 federal election the most popular party was the SVP which received 38.69% of the vote.

In the federal election, a total of 96 votes were cast, and the voter turnout was 50.8%.

[9] There were 124 residents of the municipality who were employed in some capacity, of which females made up 41.9% of the workforce.

In the tertiary sector; 4 or 28.6% were in wholesale or retail sales or the repair of motor vehicles, 4 or 28.6% were in a hotel or restaurant, 3 or 21.4% were technical professionals or scientists, 2 or 14.3% were in education.

[9] From the 2000 census[update], 25 or 10.5% were Roman Catholic, while 164 or 69.2% belonged to the Swiss Reformed Church.

In the Vaud cantonal school system, two years of non-obligatory pre-school are provided by the political districts.

[17] During the school year, the political district provided pre-school care for a total of 631 children of which 203 children (32.2%) received subsidized pre-school care.

The canton's primary school program requires students to attend for four years.