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The linear electro-optic effect in single crystals of 4-aminobenzphenone (ABP) is reported together with calibration data on LiNb[O.sub.3]. For ABP the linear electro-optic coefficients [r.sub.22] and [r.sub.32] at 488 nm were found to be 2.12 and 5.05 pm/V, respectively, with the corresponding reduced half-wave voltages being 49.4 [+ or -] 0.1 and 9.3 [+ or -] 0.1 kV. For LiNb[O.sub.3] the half-wave voltage was found to be 4.0 [+ or -] 0.1 kV at 632.8 nm and 2.4 [+ or -] 0.1 kV at 488 nm. Key words: Electro-optic, half-wave voltage, organic crystal.