Zhanna Pintusevich-Block (née Tarnopolskaya) (Ukrainian: Жанна Пінтусевич-Блок; born 6 July 1972 Nizhyn, Ukrainian SSR, Soviet Union) is a sprinter who has competed in the Olympic Games.
She was born in Nizhyn, Ukraine. Her 100 metres personal best time of 10.82 seconds was set in Edmonton, Alberta, Canada on 6 August 2001. She is Jewish and since 1999 has been married to her American coach Mark Block.
She was 1997 World 200m Champion and 2001 World 100m champion. She also won 2 World silvers and 3 European silvers in the sprints.
Block was identified by Victor Conte as allegedly having taken illegal performance-enhancing drugs supplied by Conte in the BALCO scandal.
She took part in the 100 and 200 metres races at both the 1996 Summer Olympics and the 2000 Summer Olympics, reaching the final three times. She also took part in the 100 m and 4 x 100 metres relay at the 2004 Olympics. However, she failed to progress to the finals. She has never won an Olympic medal but she managed to finish in fourth place in the 100 m final in Sydney.
 See also