Justin Williams is an American professional basketball player who currently plays for San Lorenzo. He is a 6 ft 9 in (2.06 m), 260 pounds (120 kg) power forward-center.

Club Atlético San Lorenzo de Almagro is the men's professional club basketball section of the homonymous sports club based in Buenos Aires, Argentina. The team plays in the Liga Nacional de Básquet (LNB), which is the first tier level division of the Argentine basketball league system, and Pan-America's premier men's basketball league, the Basketball Champions League Americas. Their home arena is the Estadio Ciudad de Santiago del Estero. The team is currently coached by Silvio Santander. In the period 1942-1973, he stood out for what he did at the amateur and semi-amateur level, in which he won 29 regional titles, won the Argentine Club Championship, and was South American runner-up in 1958. In addition, he was one of the founding clubs of the National League, playing the opening game of said tournament on April 26, 1985. Although the club is known mainly for its soccer part, it is also one of the most important basketball clubs in the country and South America, being a multi-champion at various times in its history. He has to his credit five Leagues, two Liga de las Américas, and other titles such as a Super 4, and two Super Cups. San Lorenzo is the first, and so far, the only Argentine basketball team to face an NBA team. It is the only club that has been four-time and five-time champion of the National League.