Harada Naojirō (原田 直次郎; 12 October 1863 – 26 December 1899) was a Japanese painter who specialized in the yōga (Western) style.

In Munich, he apprenticed under the Austrian painter Gabriel von Max, a friend of his brother Toyokichi's [ja].

While in Munich he befriended the German painter Julius Exter and the Japanese writer Mori Ōgai, who had been dispatched to Germany by the Ministry of War of Japan.

In 1886, he began to live with a woman named Marie who worked in a café on the ground floor of the building he lodged in.

On 22 November, he left a pregnant Marie and toured Switzerland, Venice, and Rome, meeting Japanese painters there, and audited classes at the École des Beaux-Arts in Paris.