This is a list of the longest serving heads of government or heads of state in the G7. The G7 leaders are the Prime Minister of Canada, the President of France, the Chancellor of Germany, the Prime Minister of Italy, the Prime Minister of Japan, the Prime Minister of the United Kingdom, and the President of the United States.
List of longest-serving G8 leaders Wikipedia
Angela Merkel is the senior G7 leader, a title she kept from 2011 until 2012, regaining seniority in 2014 upon Russia's expulsion from the G8. Merkel has been in office since 22 November 2005.
After Merkel in seniority is the Prime Minister of Japan Shinzō Abe, who took office on 26 December 2012 (previously served from 26 September 2006 to 26 September 2007), the President of France François Hollande, who took office on 15 May 2012, the Prime Minister of Canada Justin Trudeau, who took office on 4 November 2015, the Prime Minister of the United Kingdom Theresa May, who took office on 13 July 2016, the Prime Minister of Italy Paolo Gentiloni, who took office on 12 December 2016, and the last in seniority is the President of the United States Donald Trump, who took office on 20 January 2017.
The following is a chronology of senior G7 leaders from the founding of the G6 (a precursor organization to the G8) to the present.The longest period anyone has been the senior G7 leader is the six years, 151 days of Prime Minister of the United Kingdom Margaret Thatcher, who was Prime Minister for eleven years. Overall, the period of almost 3000 days that Thatcher spent as senior G8 leader is longer than the combined number of days spent by the leaders of any single other country as senior G8 leader.
The shortest period any past G7 leader has been the senior G7 leader is the 42 days of Prime Minister of the United Kingdom Tony Blair in 2007.
Silvio Berlusconi currently holds the record of G8 Summit hosting, having hosted it in Italy three times.
Despite the fact that Japan was a founding member of the G6 (which later became the G7, and then the G8), no Japanese Prime Minister has ever become the Senior G7 Leader. No Prime Minister of Japan has ever held office for more than five years, four months since the founding of the G6.
Except for Prime Minister of the United Kingdom Harold Wilson, the first person to be Senior G7 Leader, no past Senior G7 Leader has held office for less than eight years.