In commutative algebra, a regular ring is a commutative noetherian ring, such that the localization at every prime ideal is a regular local ring: that is, every such localization has the property that the minimal number of generators of its maximal ideal is equal to its Krull dimension.
Jean-Pierre Serre defines a regular ring as a commutative noetherian ring of finite global homological dimension and shows that this is equivalent to the definition above. For regular rings, Krull dimension agrees with global homological dimension.
Examples of regular rings include fields (of dimension zero) and Dedekind domains. If A is regular then so is A[X], with dimension one greater than that of A.
A regular ring need not be an integral domain. For example, the product of two regular integral domains is regular, but not an integral domain.
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