Katarzyna Tomicka
Katarzyna Tomicka z Iwna  | |
|---|---|
| Coat of arms | Łodzia | 
| Born | 1516/1518 Iwno, near Kostrzyn  | 
| Died | 1551 Wilno, Grand Duchy of Lithuania  | 
| Family | Tomicki | 
| Consort | Mikołaj "the Red" Radziwiłł | 
| Issue | Mikołaj Radziwiłł Krzysztof Mikołaj "the Thunderbolt" Radziwiłł Barbara Radziwiłł  | 
| Father | Jan Tomicki h. Łodzia | 
| Mother | Barbara Potulicka h. Grzymała | 
Katarzyna Tomicka (c.1517–1551) was a Polish noblewoman, known as the sister-in-law and opponent of her sister-in-law queen Barbara Radziwiłł.
Katarzyna was born in Iwno, the third daughter of podkomorzy of Kalisz, Jan Tomicki h. Łodzia and sister-aunt of the Court Marshal and Bishop of Kraków, Piotr Tomicki h. Łodzia. She died in Wilno.
Her sons initiated the so-called "Calvinist lineage" of the Radziwiłł family. The male line expired in 1669.