Tenniken is a municipality in the district of Sissach in the canton of Basel-Country in Switzerland.
Tenniken has an area, , of . Of this area, or 47.9% is used for agricultural purposes, while or 41.2% is forested. Of the rest of the land, or 11.4% is settled (buildings or roads).
Of the built up area, housing and buildings made up 5.8% and transportation infrastructure made up 4.5%. Out of the forested land, 40.1% of the total land area is heavily forested and 1.1% is covered with orchards or small clusters of trees. Of the agricultural land, 23.0% is used for growing crops and 20.8% is pastures, while 4.1% is used for orchards or vine crops.
The blazon of the municipal coat of arms is Per pale, Or a letter Tau Sable, and bendy of six Sable and Argent.
Tenniken has a population () of . , 6.6% of the population are resident foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of -7.3%.
Most of the population () speaks German (875 or 97.2%), with Spanish being second most common (8 or 0.9%) and French being third (4 or 0.4%).
the gender distribution of the population was 47.9% male and 52.1% female. The population was made up of 824 Swiss citizens (93.0% of the population), and 62 non-Swiss residents (7.0%) Of the population in the municipality 271 or about 30.1% were born in Tenniken and lived there in 2000. There were 328 or 36.4% who were born in the same canton, while 229 or 25.4% were born somewhere else in Switzerland, and 69 or 7.7% were born outside of Switzerland.
In there were 7 live births to Swiss citizens and 1 birth to non-Swiss citizens, and in same time span there were 3 deaths of Swiss citizens. Ignoring immigration and emigration, the population of Swiss citizens increased by 4 while the foreign population increased by 1. There was 1 Swiss man who emigrated from Switzerland. At the same time, there was 1 non-Swiss man and 1 non-Swiss woman who immigrated from another country to Switzerland.