| 11 Sep 66 | r01        | Washington CommandersWashington Co | 14 - 38 | Cleveland BrownsCleveland Bro |
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| 18 Sep 66 | r02        | Cleveland BrownsCleveland Bro | 20 - 21 | Green Bay PackersGreen Bay Pac |
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| 25 Sep 66 | r03        | Cleveland BrownsCleveland Bro | 28 - 34 | Arizona CardinalsArizona Cardi |
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| 02 Oct 66 | r04        | New York GiantsNew York Gian | 7 - 28 | Cleveland BrownsCleveland Bro |
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| 09 Oct 66 | r05        | Cleveland BrownsCleveland Bro | 41 - 10 | Pittsburgh SteelersPittsburgh St |
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| 23 Oct 66 | r07        | Cleveland BrownsCleveland Bro | 30 - 21 | Dallas CowboysDallas Cowboy |
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| 30 Oct 66 | r08        | Atlanta FalconsAtlanta Falco | 17 - 49 | Cleveland BrownsCleveland Bro |
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| 06 Nov 66 | r09        | Pittsburgh SteelersPittsburgh St | 16 - 6 | Cleveland BrownsCleveland Bro |
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| 13 Nov 66 | r10        | Cleveland BrownsCleveland Bro | 27 - 7 | Philadelphia EaglesPhiladelphia |
| 20 Nov 66 | r10        | Cleveland BrownsCleveland Bro | 14 - 3 | Washington CommandersWashington Co |
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| 24 Nov 66 | r12        | Dallas CowboysDallas Cowboy | 26 - 14 | Cleveland BrownsCleveland Bro |
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| 04 Dec 66 | r13        | Cleveland BrownsCleveland Bro | 49 - 40 | New York GiantsNew York Gian |
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| 11 Dec 66 | r14        | Philadelphia EaglesPhiladelphia | 33 - 21 | Cleveland BrownsCleveland Bro |
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| 17 Dec 66 | r15        | Arizona CardinalsArizona Cardi | 10 - 38 | Cleveland BrownsCleveland Bro |