First can be:

• an original or first instance having historical significance, for example Tom Thumb - the first US-built locomotive.
• First Post, is an Internet phenomenon on Internet discussion groups where participants strive to be the first person to "post" a comment to a new article or discussion thread.
• First is a 1978 LP album released by Jazz artist John Scofield
• the ordinal form of the number one;
• the trade name of First Group;
• FIRST, a science and technology competition founded by Dean Kamen;
• First song by Lindsay Lohan
• Ruth First (1925-1982), a leading anti-apartheid South African campaigner.
• in the British undergraduate degree classification system, the highest final grade of achievement ("Honours") as an undergraduate. Equivalent to the American summa cum laude distinction.
• First is Denise Ho's 2001 debut album.

See also

• First image on the Web
• List of firsts