。
There is nobody who doesn't wish for peace.
Literal
Peace [object-を] wish-not ones [topic-は] not-exist.
もの as a pronoun for people is more formal and literary than 人 — typical of essays, speeches, and formal rhetoric. The double-negative structure (望まないものはいない = 'there is no one who does not wish') is a classic move for emphatic affirmation: 'everyone wants peace.'