Sergei Vasilyevich Vonsovsky (also spelled as Vonsovskii or Vonsovskiy, Russian: Сергей Васильевич Вонсовский; September 2, 1910 – August 11, 1998) was a Soviet physicist.
In 1943 he defended his second thesis and received the highest scientific degree of Doctor of Sciences.
He also worked at the field of the transition metals and fusions superconductivity in particular he studied the problem of simultaneity of ferromagnetism and paramagnetism.
Ural Branch of the Russian Academy of Sciences instituted Vonsovsky Gold Medal in his honour.
The main scientific award of the Ural branch of the Russian Academy of Sciences is called the Vonsovsky Gold Medal.