Hermann Gottlieb Helmer (13 July 1849 – 2 April 1919) was a German architect who mainly worked in Austria.

[1][2] After completing an apprenticeship as a bricklayer, and some further education he joined the architecture firm of Ferdinand Fellner, Sr. After his death he founded the architecture studio Fellner & Helmer together with his son Ferdinand Fellner in 1873.

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