Jacobus Pieter Thijsse (25 July 1865 – 8 January 1945) was a Dutch conservationist and botanist.
Along with Eli Heimans and Johannes Bernink, he was active in a period of revival of biological education known as biologisch reveil.
In 1877 the father retired from the army and the family moved to Wagenaarstraat in Amsterdam where Thijsse went to the Municipal School.
In 1883 he qualified as a teacher of modern languages and taught in primary schools in Amsterdam.
[1] In 1896, along with Heimans and J. Jaspers, he started a magazine called the living nature which became very popular and had 1000 subscribers in a short time.