A method is provided of hydrogen peroxide sterilization of medical articles whereby there are obtained the advantages of both vapor penetration, especially for such articles as surgical packs, and direct liquid-sterilant article contact, in which a vapor mixture comprising hydrogen peroxide is brought into contact with the article to be sterilized, the article being at a temperature below the dew point or condensation temperature of the vapor mixture, is caused thus to condense as a liquid film on the article, and is revaporized and hence removed from the so-sterilized article.