"The Israeli government strongly condemns the terrible terror attack last night in Manchester," Netanyahu said in a statement.
"I send my condolences to the families of those murdered and wishes of swift recovery to the wounded. Terror is a global threat and the enlightened countries must act together to defeat it in any place."
Police said a man detonated a bomb at the concert on Monday night in the northwestern English city by US pop star Ariana Grande in Britain's deadliest terror attack in 12 years.
Netanyahu held talks with visiting US President Donald Trump on Monday.
Trump was meeting Palestinian president Mahmud Abbas in the occupied West Bank on Tuesday and was expected to comment on the attack later.