Madder is the common name for Rubia, a genus of flowering plants in the family Rubiaceae.
Madder may also refer to:
People
- Leo Madder (born 1946), Belgian television actor
Places
- Madder Cliffs, Antarctica
Music
- Madder Mortem, Norwegian progressive metal band
- Madder Lake, Australian progressive rock band
- Madder Rose, New York City-based alternative rock band
Other
- 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