ち, in hiragana, or チ in katakana, is one of the Japanese kana, which each represent one mora.

The kanji for one thousand (千, sen), appears similar to チ, and at one time they were related, but today チ is used as phonetic, while the kanji carries an entirely unrelated meaning.

Many onomatopoeic words beginning with ち pertain to things that are small or quick.

The dakuten form of the shi character is sometimes used when transliterating "di", as opposed to チ's dakuten form; for example, Aladdin is written as アラジン Arajin, and radio is written as ラジオ.

In the Ainu language, チ by itself is pronounced [t͡s], and can be combined with the katakana ヤ, ユ, エ, and ヨ to write the other [t͡s] sounds.