Mrs. Päivi Räsänen is being legally supported by the Human Rights organisation ADF International.
The ruling, which is now final, is a significant a victory for freedom of religion and expression.
Her ongoing legal battle has become a symbol of the delicate balance between religious freedom and free speech in modern society.
She is being accused of "inciting hatred against LGBT people".
Christians demonstrated supporting Päivi Räsänen in front of the building of the Finnish Embassy.
Finland's public prosecutors are to appeal the judgement which threw out the charges against Räsänen.
Dr. Räsänen has served as Finland's Interior Minister from 2011 to 2015.
All three charges brought against Päivi Räsänen were dismissed but the prosecution may appeal within the next seven days.