During the five-day trip he will visit Israeli research institutions, tour facilities for the disabled and meet Israelis paralyzed in terrorist attacks. He also is expected to meet Prime Minister Ariel Sharon and visit Jerusalem's Western Wall, Judaism's holiest site.
Many scientists believe stem cells from human embryos could be used to treat a vast array of conditions, from spinal injury to diabetes and Parkinson's disease.
U.S. federal law strictly limits stem cell research and Reeve has criticized the government's stance. In April, he said social and religious conservatives "have had undue influence on the critical debate."