Fenichel is a surname. Notable people with this surname include: Eli Fenichel, American economist Haimi Fenichel (born 1972), Israeli artist Lilly Fenichel (1927–2016), Austrian-born American painter Max Fenichel (1885–1942), Austrian photographer Neil Fenichel, mathematician who introduced the normally hyperbolic invariant manifold Otto Fenichel (1897–1946), Austrian psychoanalyst Sámuel Fenichel (1868–1893), Hungarian explorer