Carl August Thielo (February 7, 1702 – December 3, 1763) was a Danish composer.
theatre entrepreneur, music teacher, organist from Saxony.
He spent most of his life in Copenhagen from the 1720s onwards and founded the first opera house there in 1746.
A student of Johann Gottfried Walther, he was the author of a Danish treatise, Tanker og Regler fra Grunden af om Musiken, published in 1746.
Thielo was also the German court organist under Christian VI.