| Office: | 22nd Chief Justice of the Texas Supreme Court |
| Term Start: | October 4, 1972 |
| Term End: | October 25, 1982 |
| Appointer: | Preston Smith |
| Predecessor: | Robert W. Calvert |
| Successor: | Jack Pope |
| Office1: | Associate Justice of the Texas Supreme Court |
| Term Start1: | October 1, 1957 |
| Term End1: | October 4, 1972 |
| Appointer1: | Price Daniel |
| Predecessor1: | Few Brewster |
| Successor1: | Hawthorne Phillips |
| Birth Name: | Joe Robert Greenhill |
| Birth Date: | 14 June 1914 |
| Birth Place: | Abilene, Texas, U.S. |
| Death Place: | Austin, Texas, U.S. |
| Alma Mater: | University of Texas (BA, BBA, LLB) |
| Battles: | World War II |
Joe Robert Greenhill (July 14, 1914 - February 11, 2011)[1] was an American attorney. He served on the Texas Supreme Court for 25 years, 10 of those as chief justice.
Born in Houston, Texas, Greenhill attended the University of Texas, where he earned Bachelor of Arts and Bachelor of Business Administration degrees in 1936 and a Bachelor of Laws degree in 1939[2] where he was a member of the Texas Cowboys. During World War II, he served as junior officer in the United States Navy, first in intelligence and then as executive officer of a mine sweeper in the Pacific Theater. He became Assistant Attorney General of the State of Texas in 1948, co-founded Graves, Dougherty & Greenhill in 1950 and was appointed to the Texas Supreme Court in 1957, where he served until 1982. He received an honorary Doctor of Law degree from Southern Methodist University in 1977.
Greenhill was of counsel at Baker Botts.