Nánabeszter or Nána-Beszter (Nanabezter) was the name of a minor gens (Latin for "clan"; nemzetség in Hungarian) in the Kingdom of Hungary, which mostly possessed lands along the river Danube in Central Hungary, around the capitals Esztergom and Buda. After their only known branch, which existed until the early 14th century, the clan was also known as Berki family.