The third series of the Australian cooking game show MasterChef Australia premiered on Sunday, 1 May 2011 at 7:30 pm on Network Ten. Judges George Calombaris, Gary Mehigan and Matt Preston returned from the previous series and were joined by Matt Moran.^[1] The third series was won by Kate Bracks who defeated Michael Weldon in the grand finale on 7 August 2011.^[2] The second part of the series' final (episode 85, "The Winner Announced"), attracted an audience of 2.74 million viewers, making it the third most viewed episode of any Australian television series of 2011, only beaten by the final episodes of The Block (3.09 million) and Australia's Got Talent (2.98 million).

The third series of MasterChef Australia brought some changes to the format of the show. Joining the judging panel as a regular guest was chef Matt Moran.^[3] A twist used in past series of the show to bring back eliminated contestants for a second chance was dropped for series 3.^[3]

While the weekly routine was mostly unchanged, there were some small differences in series 3.

Sunday night's challenge was not restricted to a Mystery Box Challenge and an Invention Test, with Team and Offsite Challenges also used.^[4]

The Tuesday night challenge was modified: now known as an immunity challenge rather than a celebrity chef challenge; the standing of the opponent varied, with anyone from a contestant to an apprentice or a well-known chef appearing.^[5] The rules varied slightly from week to week, but typically the contestant(s) were given a recipe and a time advantage but neither competitor had knowledge of what they were about to cook until just before the challenge started.^[4]

Eliminations on Thursdays were no longer decided by taste tests; final challenges were based on cooking.^[5]

• Adriano Zumbo – Series Premiere: Top 50: Part 1, Pressure Test 10
• Maggie Beer – Top 50: Part 2, MasterClass 1, Pressure Test 9
• Justin North – Immunity Challenge 1, MasterClass 2, MasterClass 9
• Alessandro Pavoni – Immunity Challenge 1, MasterClass 2, Immunity Challenge 9
• Alex Keene – Immunity Challenge 1, Immunity Challenge 9
• Andrew Connole – Offsite Challenge 1
• Jean-Luc Rocha – Elimination Challenge 1
• Abla Amad – Elimination Challenge 1
• Shaun Presland – Elimination Challenge 1, MasterClass 14
• Andrew McConnell – Immunity Challenge 2
• Colin Fassnidge – Immunity Challenge 2, MasterClass 3, Worst Nightmare Challenge
• Jonathan Barthelmess – Elimination Challenge 2
• Leanne Beck – MasterClass 3
• Mark Jensen – Immunity Challenge 3
• Adam D'Sylva – Immunity Challenge 3
• Reuben Radonich – Elimination Challenge 3
• Romeo Baudouin – MasterClass 4
• Donna Hay – MasterClass 4
• Jake Drachenberg – W.A. Invention Test
• Hadleigh Troy – Immunity Challenge 4
• Tony Howell – Immunity Challenge 4
• Stefano Manfredi – Elimination Challenge 4
• Frank Shek – MasterClass 5
• Dan Hong – Pressure Test 3
• Martin Boetz – Immunity Challenge 5
• Thorsten Schmidt – Immunity Challenge 5
• Nigella Lawson – Offsite Challenge 4
• Tetsuya Wakuda – Elimination Challenge 5
• Elena Arzak – Elimination Challenge 5
• Miguel Maestre – MasterClass 6
• Rick Stein – MasterClass 6
• Chef Wan – MasterClass 6
• Neil Perry – QANTAS Fine Dining Challenge, QANTAS First Lounge Challenge
• Thomas Keller – QANTAS Fine Dining Challenge
• Andoni Aduriz – QANTAS Fine Dining Challenge
• Heston Blumenthal – Pressure Test 4
• Darren Purchese – Immunity Challenge 6
• Matt Stone – Offsite Challenge 5
• James Privett – MasterClass 7
• David Chang – Sunday Challenge 6, Ultimate Dinner Party Challenge
• Mary Calombaris – Pressure Test 5, MasterClass 8
• Jeremy Strode – Immunity Challenge 7
• Vincent Gadan – Immunity Challenge 7, MasterClass 8
• Shane Osborn – Elimination Challenge 7
• Christine Manfield – MasterClass 8, Immunity Challenge 8
• Jim Moran – Sunday Challenge 7
• Matthew Kemp – Pressure Test 6
• Merle Parrish – Immunity Challenge 8
• Dietmar Sawyere – Elimination Challenge 8
• Fleur Sullivan – MasterClass 9
• Al Brown – MasterClass 9
• Simon Gault – MasterClass 9
• Martin Bosley – MasterClass 9
• Shane Delia – Sunday Challenge 8
• Armando Percuoco – Immunity Challenge 9
• Marco Pierre White – Offsite Challenge 8
• Anthony Bourdain – Elimination Challenge 9, Sunday Challenge 9
• Andre Ursini – Masterclass 10
• Jimmy Seervai – Masterclass 10
• Luke Nguyen – Masterclass 10
• Alvin Quah – Masterclass 10
• Eric Ripert – Sunday Challenge 9
• Armando Monterroso – United Nations Challenge
• Lidia Bastianich – Immunity Challenge 10
• Cesare Casella – Immunity Challenge 10
• Jon Bignelli – Ultimate Dinner Party Challenge
• Paul Liebrandt – Ultimate Dinner Party Challenge
• Kenneth Woods – Elimination Challenge 10
• Tren'ness Woods-Black – Elimination Challenge 10
• Sylvia Woods – Elimination Challenge 10
• Daniel Boulud – MasterClass 11
• Sandy Levine – MasterClass 11
• Steve Evetts – MasterClass 11
• Kylie Kwong – Sunday Challenge 10
• 14th Dalai Lama – Sunday Challenge 10
• Tim Costello – Sunday Challenge 10
• Shanaka Fernando – Sunday Challenge 10
• Bill Crews – Sunday Challenge 10
• Ronnie Khan – Sunday Challenge 10
• Katrina Kanetani – Pressure Test 8
• Philippa Sibley – Immunity Challenge 11
• Eamon Sullivan – Immunity Challenge 11
• Alan Joyce – QANTAS First Lounge Challenge
• Ben Milgate – MasterClass 12
• Elvis Abrahanowicz – MasterClass 12
• Mark Olive – MasterClass 12
• Shannon Bennett – Immunity Challenge 12, MasterClass 14
• Teage Ezard – Immunity Challenge 12
• Donovan Cook – Worst Nightmare Challenge
• Ashly Hicks – Worst Nightmare Challenge
• Anthea Leonard – MasterClass 13
• Curtis Stone – Sunday Challenge 12
• Mark Best – Three Hat Challenge
• Peter Doyle – Three Hat Challenge
• Peter Gilmore – Three Hat Challenge
• Martin Benn – MasterClass 14
• René Redzepi – Grand Finale