Ma On Shan Country Park (Chinese: 馬鞍山郊野公園) is a park located in the central neck of the Sai Kung Peninsula in the eastern New Territories of Hong Kong.

In 1998, Ma On Shan Country Park was reduced in size by around 0.1 hectares (0.25 acres) near Nai Chung in order to accommodate the widening of Sai Sha Road.

Distant vistas of the sea and off-shore islands open up from many of the high vantage points within the park's boundaries, but most of the exploring keeps you far from the coast.

Nevertheless, some unusual pockets of vegetation have survived over the years and even the ruined slopes of Ma On Shan are notable for their wild rhododendron, orchids and some unusual ferns.

The secluded and unspoilt surroundings have fostered a range of wildlife within the park.