Yusif Haydar oglu Mammadaliyev (; December 31, 1905 – December 15, 1961) was an Azerbaijani and Soviet chemist. He was a Doctor of Chemistry, academician of the National Academy of Sciences of the Azerbaijan SSR, and was the president of the National Academy of Sciences of the Azerbaijan SSR. 
According to the statement of the 4th President of Azerbaijan, Ilham Aliyev , he is the inventor of the incendiary mixture that became known as the “Molotov cocktail”.