Paul Friedrich Reinsch (21 March 1836 in Kirchenlamitz – 31 January 1914 in Erlangen) was a German phycologist and paleontologist.
He studied natural sciences in Munich and Erlangen, afterwards working as a high school teacher in Erlangen, Zweibrücken and Baselland.
Following retirement, he settled in Erlangen as a private scholar.
In his scientific travels, he spent two years in North America and considerable time in Cyprus.
In the last 20 years of his life, he has focused his energy on the research of fossil Foraminifera.