Isaac Stockton Keith Ogier (July 27, 1819 – May 21, 1861) was a United States federal judge.
Born in Charleston, South Carolina, Ogier read law to enter the bar in 1845. He was in private practice briefly in Charleston, and then in New Orleans, Louisiana from 1845 to 1846. He was in the United States Army from 1846 to 1848. He was in private practice in New Orleans, Louisiana from 1848 to 1849. He was in private practice in San Joaquin, California from 1849 to 1850. He was a California state representative from 1849 to 1850. He was in private practice in Los Angeles, California from 1850 to 1852. He was a District attorney of Los Angeles County, California from 1851 to 1852. He was the United States Attorney for the Southern District of California from 1853 to 1854.
On January 18, 1854, Ogier was nominated by President Franklin Pierce to a new seat on the United States District Court for the Southern District of California created by 10 Stat. 265. He was confirmed by the United States Senate on January 23, 1854, and received his commission the same day. Ogier served in that capacity until his death, in San Bernardino County, California.