Italian journalist and international activist on behalf of peace (except where Italian interests required war). He won (with Louis Renault) the Nobel Prize for Peace in 1907.

At the age of 15 Moneta participated in the Milanese insurrection of 1848 against Austrian rule, and in 1859–60 he fought under Giuseppe Garibaldi in the victorious war of liberation. In 1861 he joined the regular Italian army and fought in the Battle of Custoza in 1866. After resigning from the army, he became editor (1867–96) of Il Secolo, a democratic newspaper published in Milan.

The suffering that Moneta witnessed during his military career prompted him to seek ways to abolish war, and about 1887 he founded the Società Internazionale per la Pace: Unione Lombarda (“International Society for Peace: Lombard League”) to propagandize for disarmament, a league of nations, and settlement of international disputes by arbitration. In 1898 he founded a pacifist periodical, Vita internazionale (“International Life”). In 1906 his presidency at the International Peace Conference in Milan led to his sharing the Nobel Prize for Peace. Nevertheless, in 1911 he supported Italy's war against Turkey on the grounds of an Italian civilizing mission in Libya, and in 1915 he advocated Italian entry into World War I to combat the imperialist designs of the Central Powers.