These terms may only be used to refer to members of the U.S. House of Representatives; for members of the U.S. Senate, use the word senator. Capitalize these words when they appear as a title before a name.

Do you capitalize senator and representative?

First Reference

as formal titles when they appear before one or more names. Spell out and lowercase representative and senator in all other uses.

Should the senator be capitalized?

The House of Representatives and the Senate are also capitalized. Examples of capitalizing the word include the U.S. Congress, Congress, etc.