The All New Zealand Radio Survey conducted by the Nielson research company shows Radio New Zealand National has a nationwide share of 10.5% for the 2012 calendar year - its nearest rival has 8.9%.
It's the second year in a row Radio New Zealand National has earned the title.
Radio New Zealand says its flagship Morning Report retained its position as most popular programme, with Nine to Noon, The Panel, Checkpoint, Nights, Saturday Morning and Sunday Morning also topping their respective slots.
"Radio New Zealand continues to provide top-quality programming and its audience share is well deserved" says NZ On Air chief executive Jane Wrightson. "I want to congratulate everyone who works so hard to keep informative and entertaining Radio New Zealand programming on air for 24-hours of every day of the year".
Both Radio New Zealand National and Radio New Zealand Concert are proudly funded through NZ On Air