Early favourite Sunand Prasad has been joined by Valerie Owen, who narrowly missed out on the top job in the last elections, and often outspoken RIBA councillor Peter Phillips.
Owen and Phillips only narrowly made the race - both just squeezing in before last Friday's nomination deadline.
Now the real campaign trail begins, with all three having outlined their manifestos.
Ballot papers are to be issued to RIBA-chartered members in the week beginning 12 June.
The election winner is expected to be announced on 26 July. The successful candidate will become known as RIBA president-elect until the start of their presidential term in 2007.