2003 British Touring Car Championship

The 2003 Green Flag MSA British Touring Car Championship was the 46th British Touring Car Championship (BTCC) season.

Changes for 2003
2003 saw the end of Super Touring regulations in the British series - having only been used by a small minority of teams in 2002.

Driver's Championship
{| {| class="wikitable" style="font-size: 85%; text-align:center;" ! rowspan="2" valign="middle" |Pos ! rowspan="2" valign="middle" |Driver ! colspan="2" |MON ! colspan="2" |BHI ! colspan="2" |THR ! colspan="2" |SIL ! colspan="2" |DON ! colspan="2" |SNE ! colspan="2" |CRO ! colspan="2" |KNO ! colspan="2" |ROC ! colspan="2" |OUL ! rowspan="2" valign="middle" |Pts
 * - valign="top"
 * - valign="top"