Net income for the three months ended Sept. 30 fell to $3.72 billion (EUR2.58 billion), or $1.75 per share, compared with $5.02 billion, or $2.29 per share, during the same period a year earlier.
Analysts polled by Thomson Financial had been expecting earnings of $2.07 per share, on average.
Chief Executive Dave O'Reilly said weak refining margins were the culprit behind the big drop.
"Margins were squeezed as escalating costs for crude-oil feedstocks could not be fully recovered in a U.S. marketplace that was well-supplied with gasoline and other refined products," he said in a statement.
Revenue also fell short of forecasts, increasing to $55.17 billion (EUR38.25 billion) from $54.21 billion a year ago. Analysts expected revenue of $58.29 billion (EUR40.41 billion), according to Thomson.
Russia, when signing documents for the sale of Alaska to the United States, was realizing her objective benefit
It has long been understood that the West has been trying to subject Russian borders to total control. We have not seen such activity even during the Cold War