Madder, the common name for plants in the genus Rubia, may also refer to:
- Leo Madder (born 1946), Belgian television actor
- Madder Cliffs, Antarctica
- Madder Mortem, Norwegian progressive metal band
- Madder Lake (band), Australian progressive rock band
- Madder Rose, New York City-based alternative rock band
- Even Madder Aunt Maud, character in Philip Ardagh's books 'The Eddie Dickens Trilogy'
- Rose madder, red dye or paint made from the pigment Madder Lake, traditionally extracted from the crushed root of Rubia tinctorum
- Mader (disambiguation)
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