The following teams marched in the Olympic Stadium of Stockholm on Saturday 6 July 1912
The flags they used:
Belgium
Chile
Denmark
France
United States (the
48-star flag became official on 4 July 1912, I have not yet made certain
if the flags in use in Stockholm, starting July 6, were already of the
appropriate design)
Greece
the Netherlands
Italy
Japan
Luxembourg
Norway
Portugal
Russia
Switzerland
Serbia
Great Britain
Canada
Australasia

South Africa (this
was the official flag for the Union of South Africa from 1910 to 1928)
Germany
Austria
Austria-Czechs
Hungary
Sweden
This page is part of the site "Full Olympians" by Herman De Wael. See here for a full Introduction.