Johnson departs on the back of a 6-2 FA Cup hammering at the hands of Fulham, but with Posh well placed in npower League One - they are currently seventh in the table, with games in hand on all the teams above them.
Departed: Gary Johnson has left Peterborough United
His departure came just hours after Kevin Dillon left League Two side Aldershot, also by mutual consent.
Dillon, 51, led the Shots to the play-offs last season where they lost to Rotherham in the semi-finals but the Hampshire club have struggled to repeat that form and Saturday's 2-1 home defeat to Oxford left them languishing in 20th place in the table.
Managerial departures this season August 9 - Martin O'Neill (Aston Villa) August 12 - Steve Coppell (Bristol City) August 14 - Kevin Blackwell (Sheffield United) August 19 - Chris Turner (Hartlepool)August 30 - Alan Pardew (Southampton)September 12 - Nigel Adkins (Scunthorpe)September 29 - Chris Sutton (Lincoln)October 1 - Paulo Sousa (Leicester)October 4 - Simon Davey (Hereford)October 18 - Gordon Strachan (Middlesbrough)October 24 - Craig Short (Notts County) December 6 - Chris Hughton (Newcastle)December 13 - Sam Allardyce (Blackburn)December 14 - Gary Speed(Sheffield United) December 15 - Paul Trollope (Bristol Rovers) December 29 - Brian Laws (Burnley) December 29 - Darren Ferguson (Preston)January 1 - George Burley (Crystal Palace)January 1 - Mark Stimson (Barnet)January 4 - Chris Hutchings (Walsall)January 4 - Phil Parkinson (Charlton)January 4 - Paul Simpson (Stockport)January 7 - Roy Keane (Ipswich)January 8 - Roy Hodgson (Liverpool)January 10 - Kevin Dillon (Aldershot Town)January 10 - Gary Johnson (Peterborough United) Club-by-club Premier League guide to every transfer deal in summer 2010Click here to check our stats zone for all the big leagues across the globeBreaking news: Roy Hodgson leaves Liverpool and is replaced by Kenny Dalglish
Explore more:People: Martin O'Neill, Steve Coppell, Kevin Blackwell, Chris Hughton, Paul Trollope, Gary Speed, George Burley, Kenny Dalglish, Roy Hodgson, Kevin Dillon Places: Bristol, Newcastle, Liverpool, Oxford
Source: Daily Mail