A process of producing glycidyl ethers of monohydric or polyhydric phenols is disclosed, which comprises mixing a monohydric or polyhydric phenol, dioxane or diethoxyethane, and epichlorohydrin; adding to the mixture an aqueous solution of an alkali metal hydroxide and subjecting to azeotropic distillation water, dioxane or diethoxyethane, and epichlorohydrin, followed by liquefaction of the distillate to be divided into an aqueous layer and an organic layer, and circulating the organic layer to the mixture whereas eliminating the aqueous layer. According to this process, the content of hydrolyzable chlorine which cannot be removed in a subsequent purification step is minimized and the phenol glycidyl ethers thus obtained are well suited for the use of sealing materials for integrated circuits.