Robert Gijsbertus Hartoch (24 March 1947 — 28 May 2009) was a Dutch chess International Master (1971).

In 1964, in Groningen he and Jørn Sloth were co-winners of the European Junior Chess Championship.

In 1965, in Barcelona, he finished second to Bojan Kurajica in the World Junior Chess Championship, ahead of Robert Hübner and Vladimir Tukmakov.

He played in the Dutch Chess Championship multiple times, but never finished higher than 4th place (in 1972 and 1975).

In 1971, he shared 2nd-3rd place with András Adorján in the B tournament of the Hoogovens Wijk aan Zee Chess Festival.