Ena (恵那郡; -gun) was a district located in Gifu, Japan.

On October 25, 2004 five towns and villages in the district merged into the city of Ena. On February 13, 2005 the remaining six towns and villages in the district merged into the city of Nakatsugawa at which point the district ceased to exist.

As of 2003, the district had an estimated population of 48,776 and a density of 68.95 persons per km². The total area was 707.36 km².

Former towns and villages now part of Nakatsugawa

These towns and villages merged into Nakatsugawa on February 13, 2005.

• Fukuoka
• Hirukawa
• Kashimo
• Kawaue
• Sakashita
• Tsukechi

Former towns and villages now part of Ena

These towns and villages merged into the city of Ena on October 25, 2004.

• Akechi
• Iwamura
• Kamiyahagi
• Kushihara
• Yamaoka