Hermann Bruno Otto Blumenau (German pronunciation: [ˈhɛʁman ˈbʁuːno ˈɔto ˈbluːmənaʊ̯]; December 26, 1819 – October 30, 1899) was a German pharmacist who founded the city of Blumenau, situated in the Itajaí-Açu river valley in the state of Santa Catarina, Brazil.

Blumenau was a son of a forest administrator, born in Hasselfelde, Duchy of Brunswick (in present-day Saxony-Anhalt).

Soon after, Blumenau visited London with the Consul-General of Brazil, Johann Jakob Sturz, and decided to emigrate.

After two years in Germany, he returned to Brazil in 1850 with 17 German colonists and established the colony Blumenau.

[1] Blumenau founded schools and hospitals in his growing city, and by 1880 its population totaled approximately 15,000 people, most of whom were Germans.