Lawrence H. Keeley (August 24, 1948 – October 11, 2017) was an American archaeologist best known for pioneering the field of microwear analysis of lithics. He is also known for his 1996 book, War Before Civilization: The Myth of the Peaceful Savage. Keeley worked as a professor of archaeology at the University of Illinois Chicago.

Keeley was born and raised in Cupertino, California, where he attended Cupertino High School. After high school, he went on to earn his B.A. in Anthropology from San José State University in 1970. Keeley initially pursued graduate education at the University of Oregon, but his professors encouraged him to enroll in a British university. After transferring, Keeley earned his Ph.D. in Archaeology at the University of Oxford in 1977.

Keeley had a short postdoctoral appointment at Musée royal de l'Afrique centrale in 1977. He began his academic career at the University of Illinois Chicago the following year. Keeley was promoted to assistant professor in 1984, and reached full professor in 1991. He retained this position until his 2014 retirement.

With the use of high magnification ... one can almost always isolate the used portion of the tool and reconstruct its movement during use, as well as, in the majority of cases, determine exactly which material was being worked.

— Lawrence H. Keeley, Experimental Determination of Stone Tool Uses: A Microwear Analysis (1980), p.78.

Keeley's most noted contribution to the fields of Paleolithic archaeology and experimental archaeology was his development and defense of microwear analysis in the study of stone tools and hominid behavioral reconstruction. Microwear analysis is one of two primary methods (the other being use-wear analysis) for identifying the functions of artifact tools. Both methods rely on examination of the smoothed down sections of blades, called "polishes," formed on the working edges of lithics. Microwear differs from use-wear because of the scale at which the analysis happens; microwear analysis is the use of microscopy to evaluate and understand these polishes. Keeley is considered to be a pioneer of microwear analysis, and microwear analysis has become a vital method of archaeological research.

The primary way that Keeley demonstrated the efficacy of microwear analysis was through the Keeley–Newcomer blind test. The methodology of this test was similar to other early microwear experiments, and it consisted of attempting to correctly determine tool function from analysis of lithics made and used by a researcher. The Keeley-Newcomer test differed from prior tests though because the tools were made and used by a researcher, Mark Newcomer, independent of the archaeologist, Lawrence Keeley. Keeley took up this test as a challenge from Mark Newcomer, a lecturer at London University's Institute of Archaeology and a skeptic of microwear analysis, to demonstrate the reliability of the method. Running a blind test granted their results objectivity and turned the experiment into an argument for the general use of microwear analysis in archaeological research. As a result of these original results and similar tests, microwear has enjoyed consistent use and development across the field of Paleolithic archaeology since 1977.

Despite Keeley's successful identification of the majority of the lithics provided by Newcomer and subsequent similar blind tests by other archaeologists, Newcomer wrote critically of microwear analysis in 1986. He wrote of a series of blind tests run by London University, "there has been no convincing demonstration that anyone can consistently identify worked materials by polish type alone." However, other archaeologists have defended Keeley's contribution and even criticized Newcomer's skepticism.