George Arvid Winckelmann (24 August 1884 Oulu – 15 November 1962 Helsinki) was a Finnish lawyer and a diplomat.
He became a student from Oulu Lyceum in 1902 and studied at the University of Helsinki, completing a 1905 Master's degree and a 1906 jurisprudence.
Winckelmann served as the youngest legal adviser in Helsinki in 1912-1917 and in the Ministry of Foreign Affairs as First Secretary 1918 and as Head of Division 1922-1929.
He served as Chargé d'Affaires in Tokyo from 1930 to 1933 and in Madrid and Lisbon since 1933.
Winckelmann married Gunhild Hilöa Lovisa Lagerström in 1916.