Oad or OAD may refer to:
Science and technology Auditory processing disorder or obscure auditory dysfunction (OAD), an auditory condition Object-oriented analysis and design, a software engineering approach Office of Astronomy for Development, an office of the International Astronomical Union Open Access Directory, founded by Peter Suber and Robin Peek Original Acquisition Disk, in digital forensics
Other uses Original animation DVD, an anime release bundled with its source-material manga Oad (caste), a social group of South Asia Oad language, an Indo-Aryan language Oad Street, a hamlet in Kent, England Oad Swigart (1915–1997), American baseball player Ordo Augustiniensium Discalceatorum, a Catholic religious order Oxford American Dictionary