Janša
Janša and Jansa are West Slavic surnames derived from the diminutives of the given name Jan. Notable people with the surnames include:
- Alfred Jansa
- Anton Janša (1734–1773), Slovenian apiculturist and painter
- František Jansa
- Janez Janša (born in 1958 as Ivan Janša), Slovenian politician and former Prime Minister of Slovenia
- Janez Janša (born in 1964 as Emil Hrvatin), Slovenian author, director and performer
- Janez Janša (born in 1973 as Žiga Kariž), Slovenian visual artist
- Janez Janša (born in 1970 as Davide Grassi), Slovenian performance artist
- Joško Janša
- Leopold Jansa, Bohemian composer
- Lovro Janša, birth name of Laurenz Janscha (1749–1812), Austrian painter and engraver
- Milan Janša
- Miloš Janša
- Tone Janša (born in 1943), Slovenian jazz musician
- Václav Jansa
- Vlastimil Jansa