St. Cyril and St. Methodius Day is a prominent holiday observed in Slovakia. The holiday, celebrated every 5th of July, pays tribute to two Byzantine Christian theologians and missionaries, Cyril and Methodius. These brothers, often collectively referred to as the 'Apostles to the Slavs,' are revered for their significant contributions to the spread of Christianity among the Slavic people during the 9th century.

The brothers, known for devising the Glagolitic alphabet, the precursor to the Cyrillic script, played an indispensably significant role in the cultural and religious history of the Slavic communities. By creating the first written language for Slavs capable of expressing complex philosophical and theological concepts, they successfully facilitated the translation of religious texts from Greek into Old Church Slavonic. This profound contribution still reverberates in modern-day Slovakia and other Slavic nations, and it serves as a pivotal marker of the cultural and religious identity of the people.

Celebrations of St. Cyril and St. Methodius Day in Slovakia are marked by various religious and cultural activities. These typically include special church services and processions, along with performances of traditional music and dance. Schools and public offices observe a holiday, while families gather for common meals and shared prayers. The day is also often used as an opportunity to honor the broader role of Christianity in Slovakia's history and culture, reflecting the profound impact the work of these two brothers still has centuries later.