Form 1040 - Individual Income Tax Return   1040 instructions.
Form 1040, Schedules A & B - Itemized Deductions & Interest and Dividend Inc.
Form 1040, Schedule C - Profit or Loss From Business
Form 1040, Schedule C-EZ - Net Profit from Business
Form 1040, Schedule D - Capital Gains and Losses (& Home Sales)
Form 1040, Schedule D-1 - Long & Short Term Capital Gains/Losses
Form 1040, Schedule E - Supplemental Income and Loss
Form 1040/1040A, Schedule EIC - Earned Income Credit
Form 1040, Schedule F - Farm Income and Expenses
Form 1040, Schedule H - Household Employment Taxes
Form 1040, Schedule J - Farm Income Averaging
Form 1040, Schedule R - Credit for the Elderly or the Disabled
Form 1040, Schedule SE - Self-Employment Tax
Form 1040A - Individual Return - Short Form  1040A instructions  
Form 1040A, Schedule 1 - Interest & Ordinary Income for 1040A filers
Form 1040A, Schedule 2 - Child & Dependent Care Expenses for 1040A filers
Form 1040A, Schedule 3 - Credit for Elderly or Disabled for 1040A filers
Form 1040EZ - Individual Income Tax Return  1040EZ instructions 
Form 1040NR - Nonresident Alien Income Tax Return
Form 1040V - Payment Voucher
Form 1040X - Amended Individual Income Tax Return
Form 1099DIV - Dividends and Distributions
Form 1099MISC - Miscellaneous Income
Form 1099-MSA - Distributions from Medical Savings Account
Form 1099-R - Distributions from Pensions, IRAs, & Other
Form 1116 - Foreign Tax Credit
Form 2106 - Employee Business Expenses
Form 2106EZ - Un-reimbursed Employee Business Expenses
Form 2120 - Multiple Support Declaration
Form 2210 - Underpayment of Estimated Tax
Form 2210F - Underpayment of Estimated Tax, Farmers and Fishermen
Form 2441 - Child and Dependent Care Expenses
Form 2555 - Foreign Earned Income
Form 2688 - Application for Additional Extension of Time to File
Form 3468 - Investment Credit
Form 3800 - General Business Credit
Form 3903 - Moving Expenses
Form 4137 - Social Security and Medicare Tax on Unreported Tip Income
Form 4136 - Credit for Federal Tax on Fuel
Form 4255 - Recapture of Investment Credit
Form 4506 - Request for Copy of Tax Form
Form 4562 - Depreciation and Amortization
Form 4684 - Casualties and Thefts
Form 4797 - Sales of Business Property
Form 4835 - Farm Rental Income and Expenses
Form 4852 - Substitute Form W-2 or 1099R
Form 4868 - Application for Automatic Extension of Time 
                     Behind? File this by April 15. But interest and penalties may apply.
Form 4952 - Investment Interest Expense Deduction
Form 4970 - Tax on Accumulated Distribution of Trusts
Form 4972 - Tax on Lump-Sum Distributions
Form 5329 - Return for IRA and Qualified Retirement Plans
Form 5884 - Work Opportunity Credit
Form 6198 - At-Risk Limitations
Form 6251 - Alternative Minimum Tax
Form 6252 - Installment Sale Income
Form 6765 - Credit for Increasing Research Activities
Form 6781 - Gains and Losses From Section 1256 Contracts and Straddles
Form 8271 - Investor Reporting of Tax Shelter Registration Number
Form 8283 - Noncash Charitable Contributions
Form 8332 - Release of Claim to Exemption for Child
Form 8379 - Injured Spouse Claim and Allocation
Form 8396 - Mortgage Interest Credit
Form 8453 - Declaration for an IRS E-file Return
Form 8453-OL - Declaration for an IRS E-file Return
Form 8582 - Passive Activity Loss Limitations
Form 8582CR - Passive Activity Credit Limitations
Form 8586 - Low-Income Housing Credit
Form 8594 - Asset Acquisition Statement
Form 8606 - Nondeductible IRAs
Form 8611 - Recapture of Low-Income Housing Credit
Form 8615 - Computation of Tax for Children Under Age 14
Form 8633 - Application to Participate in the IRS e-file Program
Form 8801 - Credit For Prior Year Minimum Tax
Form 8812 - Additional Child Tax Credit
Form 8814 - Election to Report Child's Interest and Dividends
Form 8815 - Exclusion of Interest from Series EE Bonds
Form 8822 - Change of Address
Form 8824 - Like-Kind Exchanges
Form 8829 - Expenses for Business Use of Your Home
Form 8839 - Qualified Adoption Expenses
Form 8846 - Credit for Social Security and Medicare Taxes Paid on Tips
Form 8850 - Pre-Screening Notice and Certification Request
Form 8857 - Request for Innocent Spouse Relief
Form 8861 - Welfare-to-Work Credit
Form 8862 - Information to Claim Earned Income Credit for Disallowance
Form 8863 - Education Credits
Form 8867 - Paid Preparer's Earned Income Credit Checklist
Form 9325 - General Information for Taxpayers to Elect to E-file
Form 9465 - Installment Agreement Request

More forms available at the IRS web site.
Oregon tax forms