Heat conduction in geometries described by the cylindrical coordinate system (r , φ, z) are discussed in this chapter. Transient radial heat flow is covered in Sections 7.2 through 7.7, for the infinite body, the long cylinder, and the infinite body with a cylindrical hole. The thin shell is discussed in Section 7.8. The use of limiting cases for two-and three-dimensional bodies is discussed in Section 7.9. Two-dimensional transient heat transfer is discussed in Sections 7.10 through 7.12 for finite cylinders and for a disk heat source on a semi-infinite body. Several steady-state cases are given in Section 7.13.