The STEM team at the University of Worcester support STEM activities in schools in Herefordshire and Worcestershire. Part of this help includes suggesting activities for STEM clubs. As the biologist on the team author, Sue Howarth was asked by teachers for ideas to use in biology clubs. This article was prompted by feedback that these ideas might be useful to a wider audience. Some ideas for activities for biology clubs are shown in Figure 1. These ideas are explored in more detail in the following sections. Most of the activities described could be modified to suit students, aged between 11 and 19 years, of different abilities and enthusiasms. A number of the activities could also be amended to suit science clubs that are not specifically focused on biology.