- Social Liberalism - An ideology that combines liberalism with welfare state, and is culturally progressive and civically liberal.
- Liberal Socialism - An ideology that combines the principles of Liberalism with Socialism.
- Radicalism - A historical movement that served as basis for the modern-day Social Liberalism.
- Reformist Marxism - An ideology that seeks to achieve communism through democratic means and is a precursor to Social Democracy and Democratic Socialism.
Ideologies like Progressivism, Social Democracy and Social Georgism are labeled by some as left-liberals.