The Dewar Shield has a rich history spanning over 100 years. Nine clubs participate in the Dewar Shield competition, Box Hill, Endeavour Hills, Footscray, Harlequin, Melbourne, Melbourne University, Moorabbin, Power House and Kiwi Hawthorn.

Each club has three senior grades that participate in the following divisions:

• Dewar Shield Premiership
• Dewar Shield Premiership Reserves (Penwill Cup)
• Dewar Shield 3rd Grade (Mawhinney Cup)

The Dewar Shield Premiership title for 202 was won by Power House Rugby Club.

The Penwill Cup for the Dewar Shield Reserves Premiership title for 2024 was won by Harlequin Rugby Club.

The Mawhinney Cup for the Dewar Shield 3rd Grade Premiership title for 2024 was won by Power House Rugby Club.