This paper discusses supergauge transformations in four-dimensional space-time, extending previous studies in two dimensions. Supergauge transformations are defined as operations that transform scalar (tensor) fields into spinors and boson fields into fermion fields. These transformations are characterized by parameters that are totally anticommuting spinors. The commutator of two infinitesimal supergauge transformations generates a combination of conformal and γ₅ transformations in four dimensions. Supergauge transformations act on multiplets of fields, which consist of tensors and spinors. The paper describes various types of multiplets and their combinations into new representations. It also shows how an invariant Lagrangian can be constructed from a multiplet, as the Lagrangian transforms by a total derivative under a supergauge transformation. The four-dimensional action integral is thus invariant. The paper provides two examples of such invariant Lagrangians, demonstrating that they can belong to different representations. The algebraic structure of supergauge transformations is discussed, showing that it forms a closed algebraic structure, similar to a Lie algebra, but with parameters that are anticommuting Grassmann numbers. The paper also discusses the combination of two supergauge representations into a third, and the algebraic structure is shown to be independent of the specific representation used. The paper concludes by noting that the algebraic structure includes conformal transformations and γ₅ transformations, and that the entire structure is generated by supergauge transformations. The paper also discusses the possibility of generalized supergauge transformations in four-dimensional space-time, which could generate an algebra containing that of general coordinate transformations. The paper provides a detailed analysis of the algebraic structure of supergauge transformations, including the composition law of parameters and the verification of the Jacobi identity. The paper also includes an appendix describing the properties of the γ matrices used in the analysis.This paper discusses supergauge transformations in four-dimensional space-time, extending previous studies in two dimensions. Supergauge transformations are defined as operations that transform scalar (tensor) fields into spinors and boson fields into fermion fields. These transformations are characterized by parameters that are totally anticommuting spinors. The commutator of two infinitesimal supergauge transformations generates a combination of conformal and γ₅ transformations in four dimensions. Supergauge transformations act on multiplets of fields, which consist of tensors and spinors. The paper describes various types of multiplets and their combinations into new representations. It also shows how an invariant Lagrangian can be constructed from a multiplet, as the Lagrangian transforms by a total derivative under a supergauge transformation. The four-dimensional action integral is thus invariant. The paper provides two examples of such invariant Lagrangians, demonstrating that they can belong to different representations. The algebraic structure of supergauge transformations is discussed, showing that it forms a closed algebraic structure, similar to a Lie algebra, but with parameters that are anticommuting Grassmann numbers. The paper also discusses the combination of two supergauge representations into a third, and the algebraic structure is shown to be independent of the specific representation used. The paper concludes by noting that the algebraic structure includes conformal transformations and γ₅ transformations, and that the entire structure is generated by supergauge transformations. The paper also discusses the possibility of generalized supergauge transformations in four-dimensional space-time, which could generate an algebra containing that of general coordinate transformations. The paper provides a detailed analysis of the algebraic structure of supergauge transformations, including the composition law of parameters and the verification of the Jacobi identity. The paper also includes an appendix describing the properties of the γ matrices used in the analysis.