The launch will see the retailer use Ocado's recently opened distribution centre in Warwickshire for deliveries through a Morrisons-liveried fleet.
The 25-year deal involves Morrisons paying up to £170 million to Ocado to acquire the site and equipment.
– Morrisons chief executive Dalton Philips
This agreement is a significant strategic step for Morrisons.
From a standing start, Morrisons will be competing in the fast-growing online channel by the end of this year with a really compelling proposition.
The customer gets our affordable fresh food delivered by Ocado's state-of-the-art distribution system.
Supermarket Morrisons is to start its online groceries business by the end of this year after unveiling a tie-up with delivery firm Ocado.
Ocado is closely linked with Waitrose, exclusively delivering the supermarket's products - as well as its own and those of branded ranges - to its customers and the move is likely to spark a backlash.
Mark Price, managing director of Waitrose, recently told The Sunday Telegraph its lawyers would seek to examine any tie-up between the other two companies.