Dark matter is the name given to the unknown substance or substances which appears to make up 26.4⁢(6)% of the total mass-energy density of the Universe, making it 5 times more abundant than normal matter. Over 50 years of measurements have given us considerable evidence for the existence of dark matter and some of its properties. However, we still do not know, microscopically, what sort of stuff it is. In recent years, researchers have started to use techniques developed in quantum science to build experiments which are sensitive to certain types of dark matter. These techniques rely on the remarkable progress in isolating and measuring specific quantum systems, to such an extent that these experiments are now sensitive to the weak perturbations due to dark matter. This article gives an introduction to dark matter and efforts to search for it with quantum sensors.