The Lackfi, Lacković,[1] Laczkfi, Laczkfy or Laczkovich were a noble family from Kingdom of Hungary and Croatia, which governed parts of Transylvania (as Count of the Székelys) and held the title of Voivode of Transylvania in the 14th century.

[2] The family also gave several Bans of Croatia (Slavonia and Dalmatia included) and Bulgaria, and held the titles of Palatine of Hungary and Prince of Zadar, Count of San Severino and Serra, as well as a Viceroy to Kingdom of Naples.

After Sigismund's accession to the throne and the Bloody Sabor of Križevci (1397), the family lost all of its political influence.

The family started with Lack, Count of the Székelys of the Herman (Hermány) clan which are thought to have sprung from the Raabs family from Raabs an der Thaya in Lower Austria later Lords of Nuremberg.

The theory says they arrived in 995 together with Giselle of Bavaria and settled in the southern area of the Pannonian Basin.