This depends on the country. See related questions.
The US does not have a Prime Minister, so there was no US Prime Minister in 1900.
Robert Gascyone-Cecil was the prime minister from 1895 to 1902.
England had a total of 33 prime ministers between the years 1800 and 1900. The prime minister in the year 1800 was Henry Addington and in the year 1900 was Robert Gascoyne-Cecil.
Sir Wilfred Laurier was elected to Prime Minister in the 1896, 1900, 1904, and 1908 Canadian federal elections.
In 1900, the leader of Sweden was Prime Minister Fredrik von Otter. He served as Prime Minister from 1898 to 1900, leading a coalition government during a period of political stability and economic growth in Sweden. The Swedish monarchy at the time was represented by King Oscar II, who reigned from 1872 to 1907.
He's not Prime Minister -- He's been dead a long time, having served as Canada's top political leader during the early 1900's.
The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.The US does not have a Prime Minister and never has had one.
No one is, there is no prime minister of Nottingham forest, but the prime minister of England is the prime minister of Nottingham
Queen Victoria was the titular head. Robert Cecil 3rd Earl of Salisbury was leader as prime minister.
Um...that would be the Deputy Prime Minister.
Scotland does not have it's own Prime Minister. The Prime Minister of the UK is also the Prime Minister of Scotland.
The Prime Minister is the head of government. Ministers are lower than the Prime minister.