The 2018 presidential campaign of Geraldo Alckmin was announced on 9 December 2017 at a national convention of the Brazilian Social Democracy Party (PSDB).

He was officially nominated on 4 August 2018, with Progressive Party Senator Ana Amélia as his running mate.

[2] Alckmin's campaign has secured a coalition with eight parties: DEM, PP, PR, PRB, SD, PTB, PSD and PPS[3] On the first round of the election on 7 October 2018, Alckmin finished fourth in the race, receiving about 4.8% of the vote.

This was the worst performance for a PSDB presidential nominee in history.

[4] As candidate, Alckmin has proposed a smaller government and reduction of taxes, and has defended the labor reform that took place in the administration of President Michel Temer.