There are more than 160 vacancies at sergeant and inspector level in the Gardai.
The AGSI says no attempt has been made over the last year to fill these positions.
The Association of Garda Sgts. and Inspectors is holding its annual conference in Co. Carlow later, where the Justice Minister will speak this evening.
The association, which represents 2,000 mid-ranking gardai, will debate the need for a higher sergeant to garda ratio of 1 to 5.
General Secretary, Eadestown resident, John Jacob, says promotions need to start now;