Benjamin Peyton Cornelius (November 9, 1850 – December 24, 1930) was an American politician and judge in Oregon.

[1] He was raised in that county and was engaged in agriculture before marrying Esther A. Barrett on November 11, 1871, in neighboring Glencoe.

[1] In 1892, Cornelius entered state politics and was elected to a two-year term in the Oregon House of Representatives as a Republican representing Washington County.

[2] Following his term as county judge he returned to farming before winning election as mayor of Hillsboro in 1903.

[3] Cornelius returned to the Oregon House in 1917 after winning election in 1916, again representing Washington County.