Flag flying days in Finland are days of the year when the national flag is flown nationwide, either by law or by custom. The flag of Finland is generally flown only on special occasions to celebrate or honour someone or something. On certain days of the year the state officially flies the flag, and recommends all private citizens to do so as well, these are the flag flying days as listed below. Any citizen has a right to fly the flag on their own property if they deem it appropriate, for example in celebration of birthdays or weddings in the family. Midsummer’s day is additionally celebrated as Flag Day in Finland.

Father's Day is a holiday of honoring fatherhood and paternal bonds, as well as the influence of fathers in society. In Catholic countries of Europe, it has been celebrated on 19 March as Saint Joseph's Day since the Middle Ages. In the United States, Father's Day was founded by Sonora Smart Dodd, and celebrated on the third Sunday of June for the first time in 1910. The day is held on various dates across the world and different regions maintain their own traditions of honoring fatherhood.

Finnish Swedish Heritage Day is a general flag flying day, which is celebrated in Finland on 6 November. The day celebrates the Swedish-speaking population of Finland, their culture, and the bilinguality of Finland. The main celebrations are aired on the radio, and many smaller celebrations are held around Finland in schools. Usually, the song Modersmålets sång is sung, celebrating the mother tongue. The Finnish Swedish Heritage Day is celebrated on the same day as Gustavus Adolphus Day in Sweden, the day that king Gustavus Adolphus of Sweden was killed at the Battle of Lützen in 1632.

Gustavus Adolphus Day is celebrated in Sweden and some other countries on 6 November in memory of King Gustavus Adolphus of Sweden. Observing the day became popular after the 200th anniversary of the king's death in 1632. It is a general flag flying day in Sweden and Finland. Today it is mainly connected with the consumption of Gustavus Adolphus pastries.

Finland's Independence Day is a national public holiday, and a flag flying day, held on 6 December to celebrate Finland's declaration of independence from Russia in 1917.

International Workers' Day, also known as Labour Day in most countries and often referred to as May Day, is a celebration of labourers and the working classes that is promoted by the international labour movement and occurs every year on May Day.

Mother's Day is a celebration honoring the mother of the family or individual, as well as motherhood, maternal bonds, and the influence of mothers in society. It is celebrated on different days in many parts of the world, most commonly in the months of March or May. It complements similar celebrations, largely pushed by commercial interests, honoring family members, such as Father's Day, Siblings Day, and Grandparents Day.