Friedrich Theodor Fröhlich (20 February 1803 – 16 October 1836) was a Swiss early Romantic composer.
His older brother Abraham Emanuel Fröhlich was a priest, writer and politician.
After completing the gymnasium in Zürich, he started studying jurisprudence in Basel and later in Berlin.
In 1826–1828 he received a grant from the cantonal government of Aargau to go to Berlin and take musical lessons from Carl Friedrich Zelter and Bernhard Klein.
Although Fröhlich had minor success in Berlin, he never received any recognition or support for his art in his home town of Aarau.