| Election Name: | 2006 Social Democratic Party leadership election |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2009 Portuguese legislative election#PSD 2005 leadership election |
| Previous Year: | 2005 |
| Next Election: | 2007 Portuguese Social Democratic Party leadership election |
| Next Year: | 2007 |
| Election Date: | 5 May 2006 |
| Turnout: | 37.3% |
| Image1 Size: | 150x150px |
| Candidate1: | Luís Marques Mendes |
| Colour1: | FF9900 |
| Popular Vote1: | 18,832 |
| Percentage1: | 90.9% |
| Leader | |
| Before Election: | Luís Marques Mendes |
| After Election: | Luís Marques Mendes |
The 2006 Portuguese Social Democratic Party leadership election was held on 5 May 2006. This was the first leadership election open to all party members, due to a change in the party's rules proposed by then party leader Luís Marques Mendes, elected in April 2005.[1] Marques Mendes was the sole candidate, thus winning with more than 90% of the votes.[2]
| Candidate | 5 May 2006 | |||||
|---|---|---|---|---|---|---|
| Votes | % | |||||
| Luís Marques Mendes | 18,832 | 90.92 | ||||
| Total | 18,832 | |||||
| Valid votes | 18,832 | 90.92 | ||||
| Invalid and blank ballots | 1,881 | 9.08 | ||||
| Votes cast / turnout | 20,713 | 37.33 | ||||
| Registered voters | 55,486 | |||||
| Sources: Official results | ||||||