Stadsfries or Town Frisian (Dutch: Stadsfries, Stadfries; West Frisian: Stedsk, Stedfrysk) is a set of dialects spoken in certain cities in the province of Friesland in the northern Netherlands, namely Leeuwarden, Sneek, Bolsward, Franeker, Dokkum, Harlingen, Stavoren, and to some extent in Heerenveen.

For linguistic reasons, the outlying and insular dialects of Midsland (Terschelling), Ameland, Het Bildt, and Kollum are also sometimes tied to Stadsfries.

The result was a mixture of Hollandic dialect vocabulary and West Frisian grammar and other language principles.

Examples: Stadsfries phonology deviates from Dutch in the absence of the voiced sounds /v/ and /z/ at the beginning of words.

These words can in fact be used as criteria for deciding whether a Hollandic-West Frisian mixed dialect can still be considered Stadsfries.

No more than a quarter of the city's population (approximately 20,000 people) speaks the language, although that percentage is higher in smaller towns.

In the first half of the twentieth century the town of Heerenveen had a local strand of Stadsfries known as Haagjes Fries, spoken especially around Oranjewoud, near the country home of the Frisian stadhouder.