Tony Blair said the celebrations of Baroness Thatcher's death were in "poor taste".
Speaking to BBC Radio Ulster, he said: "Even if you disagree with someone very strongly, you can still particularly at the moment of their passing, you should show some respect."
Mr Blair was asked if he worried there would be similar celebrations when he dies.
He replied: "When you decide, you divide. I think she would be pretty philosophical about it and I hope I will be too."
Read: Margaret Thatcher's legacy.
Read: Thatcher funeral next Weds.
More top news
John Inge, the Bishop of Worcester, says the death of his wife from cancer at the age of 51 has set him in opposition to the legislation.
A cool weekend ahead but looking dry for many with sunny spells.
Firefighters have warned residents in London that an ongoing blaze could spark the explosion of a gas cylinder.