As long as you have not turned 70.5 years old, the short answer is yes. But it may not be deductible:
You can contribute to a traditional IRA regardless of your income or coverage by an employer plan.
The deductibility depends on your income, filing status, and employer coverage.
These links provide the most recent income limits for deducting IRAs
IRA deductibility - covered by employer plan (the "retirement plan" box on your W2 is checked)