During the last decade, vinyl- and dienyltin derivatives have been extensively developed and used in organic synthesis. 'H NMR analysis of these compounds was the first analytical tool employed, together with 1 1 9 Sn NMR, for the assignment of the E or Z stereochemistry of vinylstannyl derivatives. In this paper we want to show that 1 3 C NMR is a powerful tool for structural analysis of vinyl- and dienyltin compounds. Chemical shifts and 1 3 C- 1 1 9 - 1 1 7 Sn coupling constants are reported for several examples. In all cases described, the 3J 1 3 C 1 1 9 - 1 1 7 Sn values give the most definitive argument for structural assignment, 1 J, 2 J and 3 J 1 3 C- 1 1 9 - 1 1 7 Sn coupling constants are also reported, along with the a, ss, γ, and δ effects of the stannyl group. When the vinyltin function is functionalized with a heteroatomic substituant, some important changes occur in the chemical shifts and coupling constants. Some examples are given in the α-oxygen, -sulfur, -halogen, -silyl, and -tin substituted vinyltin series.