No financial details were given but the deal will see the global television network's branding appear on the front wing endplates of the new Honda-powered car.
McLaren have yet to name a title sponsor and will unveil their MP4-30 car, to be driven by Spain's Fernando Alonso and Britain's Jenson Button this season, in an online launch on Jan 29.
The McLaren partnership, even if relatively small by Formula One standards, is a leap up the grid for CNN who most recently sponsored the Caterham team.
Caterham, who never scored a point in five years, went into administration last October and face an uncertain future.
"Our shared love of technology has united us: together we will pursue new opportunities far beyond the conventional scope of a Formula One partnership," said McLaren chief executive Ron Dennis in a statement.
McLaren, who are starting a new engine partnership with Honda, have not won a race since 2012.
(Reporting by Alan Baldwin, editing by Patrick Johnston)
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