O A rotational plastic compression molding apparatus including a plurality of circumferentially spaced female molds (38) and a plurality of circumferentially spaced male molds (34) cooperating respectively with the plurality of the female molds (38). The female molds and the male molds are rotated in synchronism and thus moved round successively through a material loading zone (A), a compression molding zone (B) and an article discharge zone (C). In the material loading zone (A) and the article discharge zone (C), each said female mold (38) and each corresponding male mold (34) are maintained in a spaced-apart inoperative relation, and in the compression molding zone (B), they are maintained in an approaching operative relation to define a mold space therebetween. In the material loading zone (A), a heat-melted plastic material is loaded in the female molds (38), and in the article discharge zone (C), the compression-molded plastic article is discharged from between each said female mold (38) and each corresponding male mold (34).