James Walker (1756 – January 31, 1800) was a lawyer, judge and political figure in Lower Canada.
In 1794, he was named judge in the Court of Common Pleas for Montreal, Quebec and Trois-Rivières districts.
Later that year, Walker was named to the Court of King's Bench at Montreal.
His daughter Juliana married James Sutherland Rudd, an Anglican priest at William-Henry, and, after Rudd's death, married Jean-Marie Mondelet, a Montreal notary and member of the legislative assembly.
Walker's brother Thomas also was a lawyer and a member of the legislative assembly.