The invention relates to anti-α2 integrin antibodies and their uses.Humunized antibodies are disclosed that bind to the I domain of α2 integrinand inhibit the interaction of α2β1 integrin with collagen. Alsodisclosed are therapeutic uses of anti-α2 integrin antibodies in treatingα2β1-mediated disorders, including anti-α2 integrinantibodie s that bind to α2 integrin without activating platelets.