Kestenbaum is a German Jewish surname. Notable people with the surname include:

• Dave Kestenbaum, Director of the Certification for Sustainable Transportation
• David Kestenbaum, American radio correspondent
• Jonathan Kestenbaum, Baron Kestenbaum, British Labour member of the House of Lords, chief operating officer of investment trust RIT Capital Partners plc
• Lawrence Kestenbaum (born 1955), attorney, politician, and the creator of the Political Graveyard website
• Louis Kestenbaum (born 1952), American real estate developer
• Richard Kestenbaum, partner in Triangle Capital LLC
• Ryel Kestenbaum (also called Ryel K), one of the founders of the Pink Mammoth artist collective
• Shabbos Kestenbaum (born 1999), American activist
• Wayne Kestenbaum, American poet and cultural critic.

• Meyer Kestnbaum (1896-1960), American businessman and advisor to President Eisenhower