| Senna | any of various plants of the genus Senna having pinnately compound leaves and showy usually yellow flowers |
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| Senna | tropical shrub (especially of Americas) having yellow flowers and large leaves whose juice is used as a cure for ringworm and poisonous bites |
| Senna | erect shrub having racemes of tawny yellow flowers |
| Senna | evergreen Indian shrub with vivid yellow flowers whose bark is used in tanning |
| Senna | North American perennial herb |
| Senna | cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods |
| Senna | very leafy malodorous tropical weedy shrub whose seeds have been used as an adulterant for coffee |
| Senna | King of Assyria who invaded Judea twice and defeated Babylon and rebuilt Nineveh after it had been destroyed by Babylonians (died in 681 BC) |