John Breckenridge Waldo (October 6, 1844 – September 2, 1907) was an American politician and jurist from the state of Oregon.

A native of Oregon, he grew up near Salem as part of a prominent pioneer political family that included father Daniel and brother William.

A trained lawyer, he was elected to the Oregon Supreme Court and served for one term from 1880 to 1886, including as the 13th Chief Justice from 1884 to 1886.

[5] John Waldo was also elected and served one term in the Oregon State House in 1888, representing Marion County.

[7] Stops included Elk, Crescent, Odell, and Davis Lakes, climbing the Middle and South Sisters, Black Butte and many others before his death in 1907.

[8] These trips helped foster his appreciation for the natural world and spark a campaign for conservation of the Cascades.