Gaffney, Cline & Associates

EXHIBIT 23.3

CONSENT OF INDEPENDENT RESERVOIR ENGINEERS

We hereby consent to the inclusion in the Endeavour International Corporation Form 10-K for the year ended December 31, 2006, and the incorporation by reference in Registration Statement number No. 333-119577 of Endeavour International Corporation on Form S-8, number 333-118503 of Endeavour International Corporation on Form S-3, Registration Statement number No. 333-128692 of Endeavour International Corporation on Form S-8, number 333-130515 of Endeavour International Corporation on Form S-3, number 333-132684 of Endeavour International Corporation on Form S-3, number 333-139304 of Endeavour International Corporation on Form S-3, and number 333-124145 of Endeavour International Corporation on Form S-3, as amended, of the reference to Gaffney, Cline & Associates Ltd.

Bentley, Hampshire, England
March 13th, 2007

Gaffney, Cline & Associates Ltd

William B. Cline PE

Director