Championships
The Toronto Marlboros won Memorial Cup seven times, more than any other team in the Cup's history. The Marlies also won 10 OHA championships in 17 final appearances.
J. Ross Robertson Cup
- 1928 Won - final opponent unknown
- 1929 Won - final opponent unknown
- 1932 Won - final opponent unknown
- 1940 Lost to Oshawa Generals
- 1941 Lost to Oshawa Generals
- 1949 Lost to Barrie Flyers
- 1951 Lost to Barrie Flyers
- 1955 Won vs. St. Catharines Teepees
- 1956 Won vs. Barrie Flyers
- 1958 Won vs. Hamilton Tiger Cubs
- 1964 Won vs. Montreal Jr. Canadiens
- 1965 Lost to Niagara Falls Flyers
- 1967 Won vs. Hamilton Red Wings
- 1970 Lost to Montreal Jr. Canadiens
- 1971 Lost to St. Catharines Black Hawks
- 1973 Won vs. Peterborough Petes
- 1975 Won vs. Hamilton Fincups
Hamilton Spectator Trophy
- 1959–1960 59 points
- 1963–1964 87 points
- 1971–1972 93 points
- 1972–1973 103 points
- 1974–1975 105 points
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Memorial Cup
- 1929 Defeated Elmwood Millionaires
- 1955 Defeated Regina Pats
- 1956 Defeated Regina Pats
- 1964 Defeated Edmonton Oil Kings
- 1967 Defeated Port Arthur Marrs
- 1973 Defeated Quebec Remparts
- 1975 Defeated New Westminster Bruins
Eastern Canadian Champions
- 1928 Lost to Ottawa Gunners
- 1929 Defeated Ottawa Shamrocks
George Richardson Memorial Trophy
- 1955 Defeated Quebec Frontenacs
- 1956 Defeated Montreal Jr. Canadiens
- 1958 Lost to Ottawa-Hull Junior Canadiens
- 1964 Defeated Notre Dame de Grace Monarchs
- 1967 Defeated Thetford Mines Canadiens
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