Former Wimbledon finalist Marion Bartoli of France is also scheduled to feature on the grass at the Edgbaston Priory Club in Birmingham in June.
"I always enjoy the grasscourt season and I am excited to return to the Aegon Classic in Birmingham and to play in front of a home crowd," said teenager Robson, the British No.1.
"It’s fantastic preparation ahead of Wimbledon."
Watson, 20, was diagnosed with Glandular Fever after the tournament in Miami in March, where she had complained of burnout after losing in the first round.
However she was at the tail-end of the illness and hopes to return in time for the French Open then grasscourt season.
"It’s fantastic news for the tournament that we now have our two top British players confirmed to play at the event," said Lawrence Robertson, commercial director for the LTA.
"Laura has risen through the ranks of tennis this past year and we’re all excited to get the chance to watch her back on British soil again."
Robson has climbed into the top 40 after a brilliant 2012 - in which she reached the last 16 of the US Open - and start to 2013.
She beat former Wimbledon champion Petra Kvitova in January's Australian Open.
The Aegon Classic will be held from June 9-16. Former winners of the event include Billie Jean King, Martina Navratilova, Pam Shriver, Maria Sharapova, Jelena Jankovic and Li Na.
- Sports & Recreation
- Edgbaston Priory Club
- Marion Bartoli