How many grand finals has collingwood lost?

Answer 1

Yes. Collingwood has won 15 Grand Finals altogether - only Essendon and Carlton have won more, in fact.

By the commencement of 2011, Collingwood had won the previous year's grand final play-off - in 2010 - marking their 15th such win.

Answer 2

26:

1901 1905 1911 1915 1918 1920 1922 1925 1926 1937 1938 1939 1952 1955 1956 1960 1964 1966 1970 1977 1979 1980 1981 2002 2003, 2011