Fframwaith gwerth sawl biliwn o bunnoedd sy'n sail i bob ffurf ar Lywodraeth Leol yng Nghymru, sef cynghorau, yr heddlu a gwasanaethau tân a chyrff eraill, yw system gyllid Llywodraeth Leol. Mae'n system gysylltiedig o grantiau’r Llywodraeth Ganolog, refeniw a godir yn lleol gan gynnwys trethi, arian cyfalaf, benthyca a buddsoddi.
The local government finance system is a multi-billion pound framework underpinning all forms of local government in Wales: councils, police and fire services and other bodies. It is an interconnected system of central government grants, locally raised revenues including local taxes, capital funding, borrowing and investment.