Theophil Joachim Heinrich Bienert (3 May 1833 – 5 April 1873) was a Baltic German botanist who lived and worked mainly in Imperial Russia.
Theophil Joachim Heinrich Bienert was born in Kandava, in the Courland Governorate of the Russian Empire (present-day Latvia), and studied in Jelgava to become an apothecary.
In 1858 he moved to Tartu in present-day Estonia and worked there as an assistant to the head of the Botanical Garden there.
In 1858-59 he participated in the Russian Geographical Society's scientific expedition to Khorasan.
The genus Bienertia is named in honour of him by Alexander Bunge.