Eugeniusz Frankowski (1884-1962) belonged to the most prominent figures in Polish ethnology of the first half of the 20th century and a true expert in Iberian studies. This article is the third of the series Iberica Frankowsciana and has been written for the 120th anniversary of the scholar's birth. The author's intention was to commemorate Eugeniusz Frankowski and his achievements both in Iberian and Basque studies. He begins with the account of Frankowski's fieldwork in Spain in the years 1914-1920 (also in Portugal and in the South of France) and his active participation in the Spanish academic life. Next, his constant relations with Spain in the 1930s are presented, as well as the activities promoting closer Polish-Spanish contacts. In the next part of the article the author describes Frankowski's scholarly achievements. However, only small part of his works has been published. Most of the studies prepared for publication, as well as ethnographic documentation were destroyed during the World War II. Many of the opinions about the researches by Frankowski and the meaning of his works in the history of Spanish ethnology, haven't been known in Poland by now.