Sir Peter Grain (1864 – 1947) was a British judge who served in Zanzibar, Egypt, Constantinople and China.

[1] Grain practiced in the criminal courts in London, sometimes as his father's junior, in England for 10 years.

[3] In 1921, Grain was appointed Assistant Judge of the British Supreme Court for China in Shanghai.

[4] In 1927, he was promoted to Chief Judge of the British Supreme Court for China on the retirement of Sir Skinner Turner[5] and was knighted in February 1928.

He continued to serve a judge in Weihaiwei until the territory was returned Chinese rule on 1 October 1930.