Mon Man Haron Monis was shot dead after a SWAT unit stormed the Sydney cafe at 2am local time.
Four other people are reported to have been seriously injured.
The siege lasted for over 16 hours.
Sydney police confirm three dead, four injured in café siege
Follow live updates and reaction to the events here.
* Gunman believed dead after Sydney police storm siege café in dramatic scenes
* Police storm Sydney hostage café
* Five more hostages escape Sydney siege
* Australian media name the hostage-taker in Sydney as Man Haron Monis.
* Parts of Sydney in lockdown as 'lone wolf' holds hostages inside café
* Sydney Opera House becomes symbol for peace during siege
* #illridewithyou: Australian social media users show solidarity with Sydney’s Muslims
* Bystanders are taking selfies at the site of the Sydney siege
* Five flee as police surround Sydney siege café
* Car-sharing service reassures customers after price increase during Sydney siege
* Siege café worker's 'heart sank' on recognising hostages
* Sydney hostages 'forced to call media'