Whit Sunday, also known as Pentecost, is a significant Christian holiday that is widely celebrated in Poland. The holiday is observed on the 50th day (seven weeks) after Easter Sunday and is a public holiday in the country. It commemorates the descent of the Holy Spirit upon the Apostles and followers of Jesus Christ while they were in Jerusalem celebrating the Feast of Weeks. This event is described in the New Testament of Christian Bible in 'Acts of the Apostles chapter 2 verses 1–31'.

In Poland, Whit Sunday is traditionally marked by church services and religious processions. Many people attend mass, where the churches often are decorated with flowers, and green branches symbolizing renewed life. Devotees also participate in religious events and ceremonies held throughout the day. It is a day of prayer and reflection, where the Holy Spirit's gifts to the believers, such as prophecy, healing and speaking in tongues are remembered and celebrated.

On a more secular level, Whit Sunday gives everyone in Poland a day off. Parades and outdoor events are common in many cities and towns, where families gather together to enjoy the holiday. Traditional Polish dishes are prepared and served as part of the celebration. It's a day marked by a lively spirit of festivity and serves as a significant link between its people's fervent faith and rich cultural heritage.