Jean Isabel Melzer OAM (née McLeod); 7 February 1926 – 18 June 2013) was an Australian politician and activist.

She was the daughter of Lilian Rosa (née Ford) and George Kenneth McLeod.

[1] In the 1960s, Melzer was active in the peace movement and was involved with the United Nations Association, the Women's International League for Peace and Freedom, the Victorian Council for Civil Liberties, and the League of Women Voters of Victoria.

In response to Australia's involvement in the Vietnam War, she joined the anti-conscription Save Our Sons movement and participated in anti-war demonstrations.

[3] She stood unsuccessfully as the lead Victorian senate candidate for the Nuclear Disarmament Party in the 1984 election.