Harmanecká Cave or Harmanec Cave (, ) is a stalactite cave in Central Slovakia. It is located on the northern side of the Kotolnica massif in the Staré Hory and Kremnica mountain ranges and south of the Veľká Fatra mountains. The closest villages are Harmanec and Dolný Harmanec; Banská Bystrica is around 16 km south east of the cave. It is formed from Middle Triassic dark-grey Gutenstein limestone with an estimated age of 220 million years. The entrance to the cave is situated at an altitude of 821 m and 260 m above the bottom of the Harmanec valley.