The Holy Spirit is God. The Father (generally called God), the Son (Jesus Christ), and the Holy Spirit are one God, but are not one another. These articles are based in what the Bible teaches about Him.
God describes Himself in mostly masculine terms: father, husband. The Hebrew names Yahweh, Elohim, Adonai, Kurios, and Theos are all linguistically masculine. At the same time, God also describes Himself in Job as giving birth, and in Isaiah as a mother. It's more complicated than simply "he" or "she."