The Italian was charged following City's Premier League clash against Everton at Eastlands on March 24 when he clashed with Toffees counterpart David Moyes.
The pair had a touchline scuffle after Moyes caught the ball, an action Mancini considered time wasting. The former Inter Milan boss accepted the charge and had a personal hearing.
Bolton striker Kevin Davies was also found guilty of improper conduct and given a suspended fine following comments made after the goalless draw against Fulham on February 6.
Davies had what would have been a late winner ruled out by referee Mark Clattenburg at the Reebok Stadium and after the game suggested the referee had "something personal" against him.
Having accepted the charge and requested a personal hearing, the commission ordered he be warned as to his future conduct and fined £7,500, which is to be suspended until the end of the 2011/12 season.
The suspended sanctions will be automatically activated should either be found guilty of a similar charge before that time, in addition to any other sanction for that offence.
Source: PA
Source: PA