Josip Ferfolja (27 September 1880 – 11 December 1958) was a Slovene lawyer and Social democratic politician, and human rights activist from the Province of Gorizia.
He attended high school in Gorizia, an important Slovene educational centre at the time; Ferfolja's school friends included historian Bogumil Vošnjak, economist Milko Brezigar, poet Alojz Gradnik, writer Ivan Pregelj, literary historian Avgust Žigon, and the prelate Luigi Fogar.
There, he joined a group of Slovene students that had become influenced by the thought of Tomáš Masaryk, professor of philosophy, and later president of Czechoslovakia.
In 1907, he joined the Yugoslav Social Democratic Party (JSDS), helping in the development of its grassroots network first in the Austrian Littoral.
After the Congress of Livorno of 1921, when most of the socialists of Trieste and the Julian March, both Italian and Slovene, joined the Communist Party of Italy, he withdrew from active politics.