Jakob Adolf Seitz (February 14, 1898, Meitingen, Germany – April 6, 1970, Switzerland) was a German–Argentine chess master and journalist.
In 1920, he tied for 2-4th in Canterbury, took 10th in Berlin, and tied for 4-5th in Kulmbach. In 1921, he tied for 8-9th in Hamburg. In 1922, he tied for 2nd-3rd in London (Major Open). In 1922/23 he tied for 6-9th in Portsmouth/Southsea. In 1923, he tied for 6-7th in Triest. In 1923/24 he tied for 5-6th in Hastings (Max Euwe won). In 1924, he took 13th in Győr. 1924/25 he took 3rd in Hastings (Géza Maróczy won). In 1925, he tied for 6-10th in Debrecen. In 1925, he took 3rd in Bologna (Mario Monticelli won). In 1925/26 he tied for 3-4th in Hastings (Alexander Alekhine and Milan Vidmar won).
In 1926, he tied for 6-7th in Milan, and tied for 3-4th in Scarborough. In 1927, he took 2nd, behind Stefano Rosselli del Turco, in Naples, and tied for 3-4th in London. In 1928, he tied for 3-4th in Cheltenham, tied for 4-5th in Dortmund, and tied for 1st-2nd with George Koltanowski in Tenby. In 1929, he took 10th in Paris (Savielly Tartakower won), tied for 4-7th in Duisburg (Carl Ahues won), and tied for 1st-2nd with Vajda in Ramsgate (B tourn). In 1930, he tied for 3-4th in Scarborough, and took 7th in Nice (Tartakower won).