Nicholas or Nick Baker may refer to:

• Nick Baker (business executive), Australian business executive
• Nicholas Baker (cyclist) (born 1957), Caymanian cyclist
• Nick Baker (Kentucky politician) (born 1937), member of the Kentucky Senate
• Nicholas Baker (politician) (1938–1997), British Member of Parliament and government minister
• Nick Baker (naturalist) (born 1972), English naturalist and television presenter
• Nicholas Baker (rower) (born 1985), Australian lightweight rower
• Nicholas John Baker, British citizen who was convicted of smuggling cocaine and ecstasy into Japan
• Niels Bohr (1885–1962), who assumed the name "Nicholas Baker" while working on the Manhattan Project

• Nicholson Baker (born 1957), American novelist
• Nicholas Robinson-Baker (born 1987), English diver
• Nick Barker (disambiguation)