The elections were called following the fall of the former Mayor of Rome Ignazio Marino, who was ousted from office after more than half of the members of the City Council resigned in October 2015.

[3] The results were widely reported as a major breakthrough for the Five Star Movement, which had previously been seen as a protest party rather than a significant political force.

[4] On 12 October 2015, the incumbent mayor Ignazio Marino announced his resignation amidst an accusation of expense scandal that had been made by some opposition parties (especially Five Star Movement and the right-wing Brothers of Italy), but on 29 October he retired the resignation.

[8] The voting system is used for all mayoral elections in Italy, in the city with a population higher than 15,000 inhabitants.

Table below shows the results for each municipio with the percentage for each coalition on the second round: Source: Municipality of Rome - Electoral Service