The tabloid newspaper is published on a Wednesday by Media Wales which is owned by the UK's largest newspaper corporation, Trinity Mirror.
Part of the Celtic Weekly Newspapers series, which publishes eight other titles in South Wales, the Leader was founded in 1899.
The Porth Gazette was published from 1900 to 1944 and during that period there was a newspaper called the Rhondda Socialist.
The Porth Gazette and Rhondda Leader was published from 1944 to 1967 while also published in Pontypridd during those years was the Rhondda Fach Leader and Gazette.
In more recent years the Rhondda Leader and Pontypridd & Llantrisant Observer combined before the Rhondda Leader again became a separate edition.