Odda is a municipality in Hordaland county, Norway. The municipality is located in southeastern Hordaland county, surrounding the southern end of the Sørfjorden. The administrative centre is the town of Odda, which is also the main commercial and economic centre of the entire Hardanger region. Other villages in the municipality include Botnen, Eitrheim, Håra, Røldal, Seljestad, Skare, and Tyssedal.
In 1927, Erling Johnson, working at Odda Smelteverk, invented a process to produce three-component, NPK fertilizers. This process is now known as the Odda process.