Hammond has served as president of ETFO since 2009.
Hammond led the 76,000 member union's fight against Ontario's Bill 115, which imposed contracts with a two-year wage freeze.
He also defended the union's protest tactics as ETFO staged a series of one-day strikes last December to protest the legislation.
Hammond says he is looking forward to ensuring ETFO's leadership in championing public education and democratic rights into the next round of collective bargaining with the province.