Yes, you need to enter your reinvested dividends and capital gains, reported on your 1099-DIV, on your tax return(s).
You did get the dividends but instead of getting them in the form of a check or cash, you just put the dividends back into your account. It's the same with interest paid on a savings/checking account. You don't get the money in hand, it just gets put into your savings/checking account.
See Where do I enter my 1099-DIV in TurboTax CD/Download?
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