Volunteers are at work around Wales every day and night of the year, so Volunteers Week is one important opportunity for us all to reflect on all their hard work.
Mae gwirfoddolwyr yn gweithio o amgylch Cymru bob dydd a nos o'r flwyddyn, felly mae Wythnos Gwirfoddolwyr yn cyfle pwysig i ni gyd fyfyrio ar eu holl waith caled.