Ascension Day, officially known as Feast of the Ascension of Jesus Christ, is a momentous religious event celebrated in Luxembourg. It is observed 40 days after Easter Sunday, demonstrating the Christian belief of Jesus Christ's ascension to heaven following his resurrection. It is a public holiday in Luxembourg, where both the Catholic and Protestant communities observe this day with impressive religious solemnity.

The traditions and customs of Ascension Day in Luxembourg revolve around attending special church services. The church services are not just attended by the elderly but are a family affair, with all members partaking. They participate in Mass, where the biblical account of Jesus’ ascension is read and a sermon relevant to the day is intended to educate and inspire the attendees' Christian faith. In Luxembourg, this is also a time for families to get together and have a festive meal.

In addition to the spiritual significance, Ascension Day also marks the beginning of a long weekend for the inhabitants of Luxembourg as it falls on Thursday, giving most people a four-day weekend. This allows Luxembourgers to enjoy short vacation trips or pursue recreational activities within the country. Despite this holiday having a religious undertone, it is also seen as an opportunity for people of all faiths to enjoy a break from the usual routine.

Other Luxembourg Public Holidays