The Austrian-Croatian Telescope (ACT) was installed at the Hvar Observatory in 1997. It is a Ritchey-Chretien telescope with the primary mirror of 1060 mm placed on the English mounting. The observations can be performed with two different secondary mirrors, one with a diameter of 400 mm (focal ratio of f/6.8), and the other one with a diameter of 260 mm (focal ratio of f/15). The telescope pointing and tracking are controlled by the computer. The ACT is equipped with CCD camera and is mostly used for observations of open clusters and variable stars.