John Lathrop (February 8, 1835 – August 24, 1910) was an associate justice of the Supreme Judicial Court of Massachusetts.

[1] Other ancestors, also with the name John Lathrop, were among the original pilgrims of Plymouth Colony and the minister at Second Church, Boston.

[1][2] After graduation, Lathrop entered the law offices of Charles C. Francis and William Caleb Loring in Boston.

[1] In 1862, after the outbreak of the Civil War, Lathrop joined the Dedham Company of the 35th Massachusetts Infantry Regiment as a captain.

[1][2] In 2020, the letters he and his brothers, who also served in the Union Army, sent to their mother were transcribed and published by the Dedham Historical Society.