John Conover Ten Eyck (March 12, 1814 – August 24, 1879) was a United States Senator from New Jersey from 1859 to 1865, during the American Civil War.

[4] Ten Eyck established a successful law practice in Burlington, New Jersey, first in partnership with Garret D. Wall, and later as the sole member of his own firm.

[7] During his Senate career, which spanned the American Civil War, Ten Eyck served on the Judiciary and Commerce committees.

[10] He enlisted as a private in order to set an example for those in attendance, and they called the unit they created the "Ten Eyck Guards" in his honor.

[11] He marched to Pennsylvania with the company, and once the Confederates had retreated, he completed his term of service upon the return of the Ten Eyck Guards to Burlington County.

[11] He was a delegate to the 1866 National Union Convention, which attempted unsuccessfully to promote post-Civil War reconciliation, including unity behind the Reconstruction policies of President Andrew Johnson.