It sounds acceptable to me, as long as there is sufficient contrast between them. It will depend on your specific design/layout, e.g. the sizes of the nav and h

It sounds acceptable to me, as long as there is sufficient contrast between them. It will depend on your specific design/layout, e.g. the sizes of the nav and header. I'm a developer, so would try to limit myself to two. (Although I've used a third one in the logo before). One way to reduce the number of fonts might be to find alternative ways to differentiate the three parts (e.g. through background color, borders, font color) Can you describe what you are trying to convey with each font?