King Chulalongkorn Memorial Day, widely recognized and celebrated in Thailand, is an annual public holiday. Falling on the 23rd of October, the day commemorates the passing of King Chulalongkorn, also known as King Rama V. He was a revered ruler who is credited with modernising the nation during his reign from 1868 to 1910. King Chulalongkorn's efforts to introduce new reforms brought about significant advancements within various sectors of the country while sparing Thailand from the colonial clutches.

During the observance of King Chulalongkorn Memorial Day, Thai people pay tribute to the great King's priceless contribution in propelling the country towards progress. A major highlight of the celebration includes a ceremony at the equestrian statue of King Chulalongkorn situated in Bangkok, the country's capital. Government officials, students, and local citizens gather to offer wreaths and pay their respects. It is a moment of reflection on the historical period of revolutionary transformation under King Chulalongkorn's reign.

The influence and impact of King Chulalongkorn can be seen throughout Thailand, including the fond nickname, 'the Great Beloved King'. His policies helped shape Thailand into the nation it is today, introducing railways, telegraph systems, and establishing a proper education system. King Chulalongkorn also enacted numerous social reforms abolishing slavery and modernizing government structures. These actions sealed his name in the heart of the Thai people, ultimately leading to the celebration of his life and works in the form of King Chulalongkorn Memorial Day.