Želiezovce (Hungarian: Zselíz, (formerly) Zseliz, (til 1895) Zeliz, Zeléz, German: Zelis (rare)) is a town in Slovakia in the Nitra Region, in the Levice District, near the Hron river.
The territory of the settlement was inhabited as early as the Bronze Age, the Quadi period and the Great Moravian period. The town was first mentioned in 1274. It was heavily damaged at the end of World War II.
The town gave name to the archeological Želiezovce group (named after a find in Veľký Pesek, now part of the village Sikenica, which was part of Želiezovce in 1986-1992).
According to the 2001 census, the town had 7,522 inhabitants. 51.25% of inhabitants were Hungarians, 47.10% Slovaks, 0.55% Roma and 0.49% Czechs. The religious make-up was 61.27% Roman Catholics, 18.43% people with no religious affiliation, and 6.37% Lutherans.