RTK may refer to:
Science and technology Real-time kinematic positioning, a technique for precision satellite navigation Receptor tyrosine kinase, high-affinity cell surface receptors
Other uses Radio Television of Kosovo, public service broadcaster in Kosovo Rentech (NYSE symbol), a former US company Right to know, a human right enshrined in law Remembering the Kanji (RTK1, RTK2, RTK3), books teaching Japanese Kanji