曲球（Curveball）是棒球中的一種球路。握球時食指與中指握在球的外側縫線處，出手時藉著手腕的順時針方向旋轉與手指的向下施力，使球造成旋轉，進而產生垂直向分力，加上重力的作用，會使球在進入本壘板前的垂直掉落幅度遠大於快速球。曲球於1870年代首次出現，是相當古老的一種變化球。
 | 此條目可參照英語維基百科相應條目來擴充。 |
參考
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- Version 1: Candy Cummings was the inventor of the curveball
- Version 2: Fred Goldsmith: co-inventor of the curveball or pitcher who gave first recorded demonstration of the curveball?
- Aerodynamics of a Curveball in Navier-Stokes Flow （頁面存檔備份，存於網際網路檔案館）
- How to Throw a Curveball （頁面存檔備份，存於網際網路檔案館） – wikiHow page outlining technique
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