Onsøy and Gressvik parish office is a religious organization that offers a diverse range of church services and activities. Among the most important services are the implementation of ceremonies such as baptisms, confirmations and funerals. The parish office also facilitates children's services in Onsøy Church, which are adapted to the youngest with a focus on engagement and learning.
In addition to traditional church activities, the parish office has an active involvement in the local community. They organize e-sports club nights for young people, which provide a social meeting place for young people. Grief groups are also offered that provide support to individuals experiencing grief and crises. The parish office also has initiatives such as presenting confirmation candidates and working with anniversary gifts for Gressvik Church, which shows their commitment to both tradition and community.