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The 1928 Auckland Rugby League season was its 19th. Devonport United won the Senior A Championship for the first time under the Devonport United name, though they had won it twice before as North Shore Albions, before the North Shore merger with Sunnyside. Marist Old Boys won the Roope Rooster trophy for the first time. This was their second major trophy after winning the championship in 1924. They also went on to defeat Devonport to win the Stormont Shield.
Ellerslie United finished last in the first grade championship and as a result had to play a promotion relegation match with the winners of the B Division which was Grafton Athletic. This was the second consecutive year they had met in this match. Ellerslie won 15-13 to retain their place in the first grade. The Grafton club then decided to amalgamate with Kingsland Rovers who were also in the B Division to gain acceptance into the 1st grade competition for the 1929 season.