Mae’r Comisiynydd Plant yn sefydliad hawliau plant annibynnol ac yn gwneud sylwadau i Lywodraeth Cymru ac i eraill fel bo angen ar farn plant a phobl ifanc a'r materion allweddol sy'n effeithio arnynt. Mae'r Comisiynydd yn herio Gweinidogion ac asiantaethau eraill yng Nghymru i gymeryd barn plant a phobl ifanc, eu pryderon a’u hanghenion o ddifri. Mae'r materion y mae'n codi yn ymdrin ag amrywiaeth o feysydd polisi a gwasanaeth ac yn cynnwys materion sy'n croesi portffolios nifer o Weinidogion.
The Children’s Commissioner is an independent children’s rights institution and makes representations to the Welsh Government and to others as necessary on the views of children and young people and the key issues affecting them.  The Commissioner challenges Ministers and other agencies in Wales to take children and young people’s views, issues and needs seriously. The matters he raises cover a range of policy and service areas and include matters that cross the portfolios of a number of Ministers.