The volume contains a selection of articles dealing with Turkic-Iranian contacts in a historical and linguistic perspective. The aim is to highlight some aspects of the long and intensive symbiosis between Turkic and Iranian peoples. Most articles are based on contributions to two international conferences convened at the Johannes Gutenberg University Mainz by the Turcological research group within the interdisciplinary research program (Sonderforschungsbereich) 295 of the Deutsche Forschungsgemeinschaft. The focus is on historical and linguistic aspects of Turco-Iranian contacts in the South Anatolian and West Iranian area.