2003 in NASCAR
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The following NASCAR national series were held in 2003:
- 2003 NASCAR Winston Cup Series - The top racing series in NASCAR.
- 2003 NASCAR Busch Series - The second-highest racing series in NASCAR.
- 2003 NASCAR Craftsman Truck Series - The third-highest racing series in NASCAR.
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{{succession box |
before = 2002 in NASCAR |
after = 2004 in NASCAR |
title = NASCAR seasons |
years = 2003 |
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