The invention relates to a positive electrode for metal-air battery, a metal-air battery including the same, and a method of manufacturing a carbon nanotube thin film. The positive electrode for metal-air battery, comprises: a plurality of carbon nanotube films comprising a first carbon nanotube layer comprising a plurality of first carbon nanotubes; and a second carbon nanotube layer adjacent tothe first carbon nanotube layer and comprising a plurality of second carbon nanotubes, wherein an alignment direction of the plurality of first carbon nanotubes in the first carbon nanotube layer andan alignment direction of the plurality of second carbon nanotubes in the second carbon nanotube layer are different from each other, and wherein an average specific tensile strength of the pluralityof carbon nanotube films is greater than or equal to about 0.1 gigapascal per gram per cubic centimeter and less than or equal to about 1 gigapascal per gram per cubic centimeter.