It is still (2010) 43.18 seconds by Michael Johnson
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The current men's 400m world record is held by Wayde van Niekerk from South Africa with a time of 43.03 seconds, set on August 14, 2016. The women's 400m world record is held by Marita Koch from East Germany with a time of 47.60 seconds, set on October 6, 1985.