Neomasculine (also known as neomasc, neoguy, or neodude) is a gender with a connection to masculinity, but in a non-traditional way, different from the way men and male-aligned people experience gender. Neomasculine challenges the concept of masculinity while being completely separated and incomparable to manhood and the concept of man as a gender or component of another gender.Neomasculine can be described as being masculine-aligned, neutral-aligned, non-aligned, and/or mingender.

Some common neomasculine experiences include:

• Having a brand new kind of masculinity that is not the same as the common or societal kind. Some may feel like it's not a "human" kind of masculinity;
• Feeling as if their masculinity is a very own kind of masculinity that can only be understood by themself.

Neoguys can still call themselves men, but not in a way that would be considered miaspec, male or male-aligned (unless they are multigender, demigender, genderfluid and/or other variations that include one or more miaspec, male and/or male-aligned genders). For example, they could use the word for self expression or because they also identify as man-related (though some people may have other reasons to do so).

The feminine equivalent is neofeminine.