John Henry Monger Jr (25 January 1831 – 23 December 1892) was a Member of the Western Australian Legislative Council from 1870 to 1875, and again from 1890 to 1892.

His younger brother, Joseph Taylor Monger, would also become a York merchant and a Member of the Legislative Council.

The two men selected over 100,000 acres (400 km2) of land on the Gascoyne River, and also held a lease on Dirk Hartog Island.

When Western Australia obtained representative government in October 1870, Monger was elected to the Legislative Council.

After Western Australia won responsible government in 1890, the Legislative Council became a nominative upper house.