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This is a list of Legislative Council results for the Victorian 1999 state election. 22 of the 44 seats were contested.
| Election Name: | 1999 Victorian Legislative Council by-elections |
| Country: | Victoria |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 18 September 1999 |
| Previous Election: | Results of the 1996 Victorian state election (Legislative Council)#By-elections |
| Previous Year: | 1996 |
| Next Election: | Results of the 2002 Victorian state election (Legislative Council)#By-elections |
| Next Year: | 2002 |
| Seats For Election: | 3 seats in the Legislative Council |
| Party1: | Australian Labor Party (Victorian Branch) |
| Seats Before1: | 2 |
| Seats1: | 3 |
| Seat Change1: | 1 |
| Party2: | Liberal Party of Australia (Victorian Division) |
| Seats Before2: | 1 |
| Seats2: | 0 |
| Seat Change2: | 1 |
There were a total of 3 Legislative Council by-elections that took place on election day following the resignation of MLCs elected at the 1996 election.
This election was caused by the vacancy following the resignation of Rob Knowles, who unsuccessfully contested the lower house seat of Gisborne.
This election was caused by the vacancy following the resignation of Barry Pullen.
This election was caused by the vacancy following the resignation of Caroline Hogg.