Template:1984 Saint-Leonard municipal by-elections/Mayor

! style="text-align:right;" colspan=3 |Total valid votes ! style="text-align:right;" | 21,223 ! style="text-align:right;" | 100
 * style="text-align:left;" colspan=2 |Ralliement de Saint-Léonard
 * style="text-align:left;" | Raymond Renaud
 * style="text-align:right;" | 10,307
 * style="text-align:right;" | 48.57
 * style="text-align:left;" colspan=2 |Action civique de Saint-Léonard
 * style="text-align:left;" | Domenico Moschella
 * style="text-align:right;" | 5,568
 * style="text-align:right;" | 26.24
 * style="text-align:left;" colspan=2 |Union municipale de Saint-Léonard
 * style="text-align:left;" | Rosario Ortona
 * style="text-align:right;" | 5,348
 * style="text-align:right;" | 25.20
 * style="text-align:left;" | Rosario Ortona
 * style="text-align:right;" | 5,348
 * style="text-align:right;" | 25.20
 * colspan=5|Sources: Il Settimanale, 11 September 1984; Montreal Gazette, 1 October 1984.
 * colspan=5|Sources: Il Settimanale, 11 September 1984; Montreal Gazette, 1 October 1984.