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Pyroelectric properties of orthorhombic Bi₂ZnB₂O₇ (BZBO) crystals were investigated by using the charge integration method. The primary and the secondary pyroelectric coefficients of BZBO crystals were found to be 6.4 and −6.5 µC/(m²·°C), respectively. The pyroelectric performance was evaluated by different figure of merits (FOMs), where BZBO crystals possessed relatively high current responsivity <i>F_i</i> (10.38 pm/V), and detectivity <i>F_d</i> (11.31 × 10⁻⁵/Pa^1/2). In addition, the temperature dependent behaviours of primary pyroelectric coefficients and FOMs were studied from 15 °C to 155 °C; the pyroelectric properties were found to decrease with increases in temperature.