Joachim Christian Timm (7 December 1734 – 3 February 1805) was a German apothecary, mayor of Malchin, and a botanist with a particular interest in cryptograms.

In 1749 he started a five-year apprenticeship as an apothecary, initially with Friedrich John in Wangerin, where he served for a year as an assistant.

At the end of the 1750s he moved to Malchin to manage the apothecary business of Georg Heinrich Kruger and his successors.

They had ten children, including the sons Joachim (1768–1801) and Hans Timm (1774–1852), who one after the other succeeded their father as the official apothecary in Malchin.

Joachim Christian Timm died in Malchin in 1805 and is regarded today as a pioneer of modern botany in Germany.