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We investigate the CP-odd Higgs boson production via two-photon processes in$e\gamma$ collisions. The CP-odd Higgs boson, which we denote as $A^0$, isexpected to appear in the Two-Higgs Doublet Models (2HDM) as a minimalextension of Higgs sector for which the Minimal Supersymmetric Standard Model(MSSM) is a special case. The scattering amplitude for $e\gamma\rightarroweA^0$ is evaluated at the electroweak one-loop level. The dominant contributioncomes only from top-quark loops when $A^0$ boson is rather light and$\tan\beta$ is not large. There are no contributions from the $W$-boson and$Z$-boson loops nor from the scalar top-quark (stop) loops. The differentialcross section for the $A^0$ production is analysed.

CP-odd Higgs Boson Production in $e\gamma$ Collisions