| Election Name: | 1999 Comhairle nan Eilean Siar election |
| Country: | Scotland |
| Flag Image: | Western Isles Council Flag.svg |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 1994 Western Isles Area Council election |
| Previous Year: | 1994 |
| Next Election: | 2003 Comhairle nan Eilean Siar election |
| Next Year: | 2003 |
| Seats For Election: | All 31 seats to Western Isles Council |
| Majority Seats: | 16 |
| Party1: | Independent (politician) |
| Leader1: | Donald Mackay |
| Leaders Seat1: | Lochs |
| Last Election1: | 25 seats, 89.8% |
| Seats1: | 22 |
| Popular Vote1: | 6,866 |
| Percentage1: | 74.1% |
| Seat Change1: | 3 |
| Swing1: | 15.7% |
| Party2: | Labour Party (UK) |
| Last Election2: | 4 seats, 10.2% |
| Seats2: | 5 |
| Popular Vote2: | 935 |
| Percentage2: | 10.1% |
| Seat Change2: | 1 |
| Swing2: | 0.1% |
| Party3: | Scottish National Party |
| Last Election3: | Did not stand |
| Seats3: | 4 |
| Popular Vote3: | 1,468 |
| Percentage3: | 15.8% |
| Seat Change3: | 4 |
| Swing3: | New |
| Map: | Results, by ward. |
| Council Convener | |
| Posttitle: | Council Convener after election |
| Before Election: | Donald Mackay |
| Before Party: | Independent (politician) |
| After Election: | Alex Macdonald |
| After Party: | Independent (politician) |
An election to Comhairle nan Eilean Siar was held on 6 May 1999 as part of the wider 1999 Scottish local elections.
The council, formerly known as Western Isles Council, had been renamed in 1997 in Gaelic as Comhairle nan Eilean Siar. Council ward boundaries had also been changed since the previous election, and the total number of wards was increased from 30 to 31.
The election was the first since 1994. Whilst the new Scottish councils had seen elections in 1995, the three Island Councils (Western Isles, Shetland and Orkney) had not, as they had not been affected by the abolition of the regional and district levels of governance in Scotland. The Island Councils had instead utilised a unitary system, like that adopted by the other Scottish councils in 1995, since their inception.[1]
The Scottish National Party ran candidates for the first time, gaining four seats.