EXHIBIT 23
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          CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (Nos. 33-83160 and 33-06565) of Zoltek Companies,
Inc. of our report dated January 3, 2006, relating to the consolidated
financial statements and financial statement schedule of Zoltek Companies,
Inc., which appears in this Form 10-K.

/s/PricewaterhouseCoopers LLP
- -----------------------------
PricewaterhouseCoopers LLP
St. Louis, Missouri
January 3, 2006