Oltingen is a municipality in the district of Sissach in the canton of Basel-Country in Switzerland.
Oltingen is first mentioned in 1244.
Oltingen has an area, , of . Of this area, or 59.9% is used for agricultural purposes, while or 33.8% is forested. Of the rest of the land, or 5.8% is settled (buildings or roads) and or 0.3% is unproductive land.
Of the built up area, housing and buildings made up 2.4% and transportation infrastructure made up 3.2%. Out of the forested land, 31.8% of the total land area is heavily forested and 2.1% is covered with orchards or small clusters of trees. Of the agricultural land, 22.8% is used for growing crops and 31.9% is pastures, while 5.2% is used for orchards or vine crops.
The municipality is located in the Sissach district, at the foot of the old road over the Schafmatt pass.
The blazon of the municipal coat of arms is Or, on a Bend Sable three Horse-shoes Argent.
Oltingen has a population () of . , 5.5% of the population are resident foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 0.7%.
Most of the population () speaks German (388 or 95.8%), with Spanish being second most common (5 or 1.2%). There is 1 person who speaks French.
the gender distribution of the population was 48.0% male and 52.0% female. The population was made up of 414 Swiss citizens (95.2% of the population), and 21 non-Swiss residents (4.8%) Of the population in the municipality 207 or about 51.1% were born in Oltingen and lived there in 2000. There were 98 or 24.2% who were born in the same canton, while 65 or 16.0% were born somewhere else in Switzerland, and 32 or 7.9% were born outside of Switzerland.
In there were 2 live births to Swiss citizens and were 4 deaths of Swiss citizens. Ignoring immigration and emigration, the population of Swiss citizens decreased by 2 while the foreign population remained the same. There were 3 Swiss men and 2 Swiss women who immigrated back to Switzerland.