PALO ALTO, Calif. (AP) _ Hewlett-Packard Co. will switch the headquarters of its Personal Computer Group from California to Grenoble, France, the company announced Thursday.

The company also said that Jacques Clay, general manager of its Grenoble Personal Computer Division, has been named general manager of the group.

It has not been determined whether the 650 workers at the division's current headquarters in Sunnyvale will remain there, said spokeswoman Irene Economou.

''He (Clay) will be looking at the organization to determine where the staff should be logically located,'' she said.

Lewis Platt, head of the company's Computer Products Sector, said the move was prompted by the important of Hewlett-Packard's international sales.

''Currently, international markets represent more than half of HP's sales of PCs and terminals and have great potential for expansion,'' he said. ''As such, it is quite opportune to have an international PCG headquarters.''

Clay, 47, who joined Hewlett-Packard in 1973, replaces Robert Puette, who recently left the company.

Hewlett-Packard has two plants in the Grenoble region that produce personal computers, terminals and cardiology equipment. It has about 4,000 workers in France.

Hewlett-Packard, which has 92,000 employees worldwide, had revenues of $11.9 billion in its 1989 fiscal year.