This marked a 4.88% year-on-year decrease and an 11.47% decline from the previous quarter.
Production was down 5.2% year-on-year to 677,800 units.
The association consists of Honda, Piaggio, Suzuki, SYM, and Yamaha.
The numbers do not include exports.
The Vietnamese motorbike market also has other brands such as VinFast, Ducati, BMW Motorrad, Harley-Davidson, Kawasaki, Triumph, KTM, Yadea, and Royal Enfield.
Vietnam had the highest motorbike ownership rate in Southeast Asia of 72.8% last year, according to Seasia Stats, a platform that provides statistical data and infographics.