Short answer. No. Contracting marriage requires parental consent until the age of twenty-one — this is the express exception the law kept when it lowered the age of majority to eighteen. You are an adult for almost every other purpose, and still not free to marry on your own signature.
What the law says
Contracting marriage shall require parental consent until the age of twenty-one.
RA 6809, Section 3 — Effect Of Emancipation. Read the full provision →
What the law says
Emancipation shall terminate parental authority over the person and property of the child who shall then be qualified and responsible for all acts of civil life, save the exceptions established by existing laws in special cases.
RA 6809, Section 3 — Effect Of Emancipation. Read the full provision →
An exception written into the same sentence that grants adulthood
The provision that ends parental authority at eighteen — Emancipation shall terminate parental authority over the person and property of the child who shall then be qualified and responsible for all acts of civil life, save the exceptions established by existing laws in special cases. — is immediately followed by Contracting marriage shall require parental consent until the age of twenty-one. The drafters granted full civil capacity and carved marriage back out of it in consecutive lines. That is a deliberate judgement that marriage is not simply another contract, and it is why an otherwise complete adult still needs a parent at the licence application.
Consent, then advice
The requirement is not permanent and it is not uniform. Between eighteen and twenty-one what the law demands is parental consent — genuine permission, without which the licence should not issue. From twenty-one until twenty-five a separate Family Code provision asks instead for parental advice, which is a lesser thing: the parents are consulted and their view recorded, but their disapproval does not bar the marriage, though it does affect the timing of the licence. Knowing which of the two applies to you is the first practical question, and it turns entirely on your age at application.
Marrying without the consent required
A marriage solemnised without the parental consent the law requires is voidable rather than void. The difference is substantial: a voidable marriage exists and produces its effects until it is annulled in a proper action brought by a party entitled to bring it, within the period the law allows. It is not a nullity anyone can simply disregard, and it is not something a registrar undoes. But it is vulnerable in a way a fully consented marriage is not, which is a poor foundation to start on.
Below eighteen the question does not arise
Nothing here should be read as suggesting that a younger person could marry with a parent behind them. Child marriage is now prohibited outright by Republic Act No. 11596, which penalises the facilitation and solemnisation of the marriage of a child, and parental agreement is no answer to it — the statute is aimed squarely at the adults who arrange such marriages. The parental-consent rule in this section speaks only to the band between eighteen and twenty-one, where the person is legally capable of marrying and simply may not do it alone.