Euphemia of Kuyavia (c. 1265 – 18 March 1308[citation needed]) was a Kuyavian princess and Queen consort of Galicia-Volhynia.
She was the daughter of Prince Casimir and the wife of Yuri I, who died in the same year on 21 April, which was also his birthday.
In the absence of sources of an accurate date of birth, it is not possible to determine when Euphemia was born.
There is also a possibility, though less likely, that she received her name from a daughter of Swantopolk II, Duke of Pomerania because her father tried to make peace with him.
Certainly, the marriage took place before the second half 1290, the year in which Euphemia's niece, Fenenna of Kuyavia married Andrew III of Hungary.