Hetero, sometimes shortened to "hetro", is a prefix used for the following:
- Heterosexual, a sexual orientation where a person is sexually attracted to people of a gender different from their own
- Heteroromantic, the equivalent romantic orientation
- Heteroflexible, an orientation where the individual is "mostly straight", rarely pursuing attraction to their own gender
- Heteroqueer, a term for someone who is both queer and straight
- Heteronormative, a norm against non-straight people