In this Letter, the authors report on a 26 GHz joint communication–radar system. By exploiting the beam steering features of leaky‐wave antennas, angle‐of‐arrival estimation and multi‐user transmission are achieved. Furthermore, the Zadoff–Chu preamble of the OFDM waveform is used to provide a frequency‐modulated continuous‐wave radar signal. This way, the wide operational bandwidth is used for both, communications and radar, yielding high data throughput and precise user localisation. Experimentally, spectral‐efficient 16‐QAM multi‐user 5 × 4 Gbit/s communications and user localisation with an accuracy of about 2 cm and ±1.5° is demonstrated. [ABSTRACT FROM AUTHOR]