YA

YA may refer to:

• Young adult literature, a library and publishing classification
• Yottampere, a unit of measurement
• Yet another, a common initial part of acronyms
• Yahoo! Answers, a community-driven question-and-answer site
• Young Ace, a Japanese magazine
• YoungArts, a scholarship program for American high school students

yA may refer to:

• Yoctoampere, a unit of measurement

Ya may refer to:

• Ya (Cyrillic) (Я), a Cyrillic alphabet letter (which, on its own, means "I" in several Slavic languages)
• Yodh also written as Yaa, an Arabic letter
• A vocative particle in Arabic and other Semitic languages.
• Ya (kana), the Romanisation of the Japanese kana や and ヤ
• Ya (arrow), the Japanese word for arrow