Abstract: There exist worldwide data on the total burden of atmospheric ozone since about 1955, and for comparison of these data with calculations using two-dimensional radiative/chemical/dynamics computer codes, a list is needed and is here presented of all major time-varying perturbations that have been suggested over the time frame 1955–1975. Detailed consideration is given to the following: variations in solar UV radiation with sunspot cycle, atmospheric nuclear explosions, halocarbons, major volcanic eruptions, galactic cosmic rays, and solar proton events. For material injected directly into the stratosphere, the time-, altitude-, and latitude-dependent source strengths are listed, while for ground-based sources the time- and latitude-dependent atmospheric emission rates are given. Some other factors that may affect the long-term behavior of stratospheric ozone but that cannot yet be modeled quantitatively are also listed.