Additionally, the club has claimed the Meath Senior Hurling Championship title twice, placing it among the top teams in the county.

The name was inspired by Pierce Charles de Lacy O'Mahony (1850-1930), a Member of Parliament for North Meath, a Parnellite, and an advocate for home rule.

By choosing this name, they honored a historically successful club and Pierce O'Mahony's support for home rule.

In 1895, they represented Meath in the All-Ireland Final against Arravale Rovers GAA from Tipperary but lost under controversial circumstances.

[citation needed] As a compromise, a special set of medals was presented to Meath as virtual winners of the championship.

At the time, dressing facilities or showers were not available, so players changed clothes along the nearest ditch to the playing area.

They won the 1956 Meath Intermediate Football Championship against Dunshaughlin and after a lapse of four years, they regained the Keegan Cup in 1957 and went on to win five times in a row from 1957 to 1961.

Most of their players moved to O'Mahonys when they reached minor age, which contributed to the club's subsequent successes.

The amalgamation occurred in 1989, marking a new era of success at the underage level, with the club winning a record number of titles in the following years.

The development of O'Mahonys as a prominent club in hurling and football coincided with the rise of Meath's impact at the inter-county level.

The club has been represented by notable footballers such as Joe Cassells, David Beggy, Finian Murtagh, Donal Smyth, Patsy Ratty, Willie McGuirk, John Brady, and Séamus Clynch.

O'Mahonys hurlers who have represented Meath at the inter-county level include Ben Tansey, Gerry Kelly, Pádraic Coone, Niall and Shane McKeigue, Trevor Donoghue, and Seamus Duignan.

The success of St.Patrick's Classical School in its All-Ireland Senior Football Colleges triumphs of 2000 and 2001 under Team Manager Colm O'Rourke highlights another dimension involving O'Mahony's players.

The starting lineup at Croke Park in May 2001 against St. Jarlaths of Tuam contained nine O'Mahony's players with another five in the support panel.

The O'Mahony's were formerly owned by the Royal Meath Agricultural Society grounds on which the clubhouse is situated at Brews Hill.

The indoor show events took place in the "Pavilion" which occupied the site where the O'Mahony's clubhouse now stands.

The existing grounds on Brews Hill in Navan was named Paddy O'Brien Park in summer 2015, in honor of Paddy O'Brien, a prominent figure in O'Mahony's who passed away in 2010 Many members of O'Mahony's have given sterling service while serving as officers on the Meath County Board.

A number of players from Navan O'Mahonys have represented Meath at the inter-county level in both hurling and football, including: