Wāpuro rōmaji (ワープロローマ字), or kana spelling, is a style of romanization of Japanese originally devised for entering Japanese into word processors (ワードプロセッサー, wādo purosessā, often abbreviated wāpuro) while using a Western QWERTY keyboard.

In Japanese, the more formal name is rōmaji kana henkan (ローマ字仮名変換), literally "Roman character kana conversion". One conversion method has been standardized as JIS X 4063:2000 (Keystroke to KANA Transfer Method Using Latin Letter Key for Japanese Input Method); however, the standard explicitly states that it is intended as a means of input, not as a method of romanization.

Wāpuro rōmaji is now frequently employed in general-purpose computer input as well as word processing, but the name lives on. Wāpuro-style romanizations are also frequently used by native speakers of Japanese in informal contexts, as well as by many fans of anime and other aspects of Japanese culture. A common characteristic of these (often online) cases is the avoidance of hard-to-type circumflexes or macrons. Also, some ambiguities in spelling may exist. Spellings are seen that would fail to produce the desired kana when typed on a computer, for example failure to distinguish between ず (properly entered as "zu") and づ (properly entered as "du").