Imreffy de Szerdahely (or Imreffi) was a Hungarian noble family from the kindred of Győr.

The forefather of the family was Péter (c. 1321 – c. 1347), the second son of Ders Szerdahelyi.

He inherited the Pauline monastery in Szerdahely (today Kaposszerdahely) from his elder brother, Miklós (the ancestor of the Dersffy family).

However the lordship of Szerdahely itself remained in Miklós' hand.

Péter's great-great grandchild, György was the first member who used the surname of "Imreffy" (son of Imre after his father).