Tall oil rosin is a natural resin derived from tall oil, a byproduct of the wood pulping process, particularly the kraft pulping of pine wood. It is obtained through the distillation or fractionation of tall oil. Tall oil rosin is a complex mixture of resin acids, predominantly abietic acid, and other components such as fatty acids.

Tall oil rosin has various industrial applications, particularly in the production of adhesives, inks, coatings, and other chemical products. It is valued for its tackifying, adhesive, and water-resistant properties, making it useful in a wide range of formulations. Additionally, tall oil rosin can also be used in the manufacturing of paper sizing agents, rubber compounds, and certain types of soaps and detergents.