Magnetic susceptibility, 119 Sn and 151 Eu Mossbauer effect measurements are reported for the Zintl phase EuZnSn which crystallizes with the TiNiSi-type structure. The stannide shows Curie–Weiss behaviour above 40 K with an experimental magnetic moment of µ exp =7.88(5) µ B /Eu, close to that of the free Eu 2+ ion of µ eff =7.94 µ B . At 20.5(2) K a magnetic phase transition to the antiferromagnetic state is observed in the temperature dependence of the inverse susceptibility at a magnetic flux density of 0.01 T. Magnetization measurements at 5 K indicate metamagnetism with a saturation magnetic moment of 6.80(5) µ B /Eu and a critical field of 0.7(1) T. 151 Eu Mossbauer measurements show an isomer shift δ=-10.9 mm s -1 against EuF 3 , as is typically observed for divalent europium. While onset of magnetic ordering is evident at T 0 =26.5(5) K, full magnetic order is detected near 15 K. 119 Sn Mossbauer spectra show a large transferred magnetic field of 12.8 T at 4.2 K. The temperature dependence of this field is closely correlated with the internal magnetic field measured at the 151 Eu site (23.4 T at 4.2 K).