Zlatná na Ostrove (Hungarian: Csallóközaranyos, pronounced [ˈtʃɒlːoːkøzɒrɒɲoʃ]) is a village and municipality in the Komárno District in the Nitra Region of south-west Slovakia.

The village lies at an altitude of 120 metres and covers an area of 35.407 km². It has a population of about 2555 people.

In the 9th century, the territory of Zlatná na Ostrove became part of the Kingdom of Hungary. In historical records the village was first mentioned in 1267. After the Austro-Hungarian army disintegrated in November 1918, Czechoslovak troops occupied the area, later acknowledged internationally by the Treaty of Trianon. Between 1938 and 1945 Zlatná na Ostrove once more became part of Miklós Horthy's Hungary through the First Vienna Award. From 1945 until the Velvet Divorce, it was part of Czechoslovakia. Since then it has been part of Slovakia.

The village is about 91% Hungarian, 8% Slovak with minorities.

The village has a public library and a football pitch.