Wikipedia:WikiProject Gilbert and Sullivan/Opera categories
Following the guidelines at Wikipedia:WikiProject Opera#Categories, all of the Gilbert and Sullivan operas are categorized as follows:
The operas that Arthur Sullivan wrote with other librettists, except for Ivanhoe, are categorized as follows:
The operas that W. S. Gilbert wrote with other composers are categorized as follows:
In each of the above scenarios, the minimum categories are listed. Some works also fall into additional categories. See The Pirates of Penzance and The Emerald Isle for examples.