Negiah (Hebrew: נגיעה), literally "touch", is the concept in Jewish law (Halakha) that forbids or restricts sensual physical contact with a member of the opposite sex except for one's spouse, outside the niddah period, and certain close relatives to whom one is presumed not to have sexual attraction. A person who abides by this halakha is colloquially described as a shomer negiah ("one observant of negiah").

The laws of negiah are typically followed by strict Orthodox Jews, with varying levels of observance. Some Orthodox Jews follow the laws with strict modesty and take measures to avoid accidental contact, such as avoiding sitting next to a member of the opposite sex on a bus, train, airplane, or other similar seating situations. Others are more lenient, only avoiding purposeful contact. Adherents of Conservative and Reform Judaism do not follow these laws. Many Jews with Orthodox beliefs believe that there is extensive room for leniency and that strict adherence to these rules stunts development and prevents social success and ultimately undermines well-being. Others understand the rules as clearly referring to sensual touch.