Lilly Fenichel (1927–2016), was an American painter who explored abstraction through a wide range of media and approaches, with her various periods linked together by a common emphasis on color harmonies and expressive, often calligraphic gesture.

[4][5] She then moved to the San Francisco Bay Area to study at the California School of Fine Arts (1950–52),[5] where she worked with the painters Edward Corbett, Hassel Smith, Elmer Bischoff, and David Park.

Her vigorously gestural, often black-and-white paintings from the 1960s and 1970s are grouped with work by other West Coast second-generation Abstract Expressionists such as Joan Brown, Jay DeFeo, and Sonia Gechtoff.

"[4] In the early 1980s, Fenichel also began working with wood and fiberglass, creating minimalist sculptures in soft colors.

[10] In 2023 her work was included in the exhibition Action, Gesture, Paint: Women Artists and Global Abstraction 1940-1970 at the Whitechapel Gallery in London.