Galtymore or Galteemore (Irish: Cnoc Mór na nGaibhlte, meaning 'big hill of the Galtees') is a mountain in the province of Munster, Ireland. At 917.9 metres (3,011 ft 6 in), it is one of Ireland's highest mountains, being the 12th-highest on the Arderin list, and 14th-highest on the Vandeleur-Lynam list. Galtymore has the 4th-highest topographic prominence of any peak in Ireland, which classifies Galtymore as a P600, or "major mountain". It is one of the 13 Irish Munros.

The Galtee mountains are formed from sandstone and shale and contain 24 peaks above 100 metres (330 ft). It runs east-west for thirty kilometres (20 mi) between counties Tipperary and Limerick; Galtymore is the highest point of both counties. The mountain is accessed by hillwalkers via the 3–4 hour Black Road Route, but is also summited as part of the longer 5–6 hour Circuit of Glencushnabinnia, and the at least 10–hour east-to-west crossing of the entire range, called the Galtee Crossing, which is climbed annually in the Galtee Challenge.

The mountain and its deep corrie lakes are associated with various Irish folklore tales regarding Saint Patrick and serpents.

Irish academic Paul Tempan in his Irish Hill and Mountain Names Database (2010), listed "Galtymore" as the name for the peak, and "Galty Mountains" as the name for the range. This is anglicised from Irish: Cnoc Mór na nGaibhlte, meaning 'big hill of the Galtees'. "Galtymore" is recorded as early as the Civil Survey of Co. Tipperary (Down Survey, 1654–56) as a boundary feature of the barony of Clanwilliam. The peak is named "Galtymore Mountain" on the Ordnance Survey Ireland Discovery Map. The townland on its southern slopes is named Knocknagalty (Cnoc na nGaibhlte).

Some guidebooks and other publications suggest that the name "Galty" or "Galtees" is an anglicisation of Sléibhte na gCoillte (mountains of the forests). The 19th century diarist Amhlaoibh Ó Súilleabháin recorded a different Irish name, Beann na nGaillti, and the names of three nearby places are derived from this: Glencoshnabinnia (P. W. Joyce, Irish Names of Places iii, 366), Slievecoshnabinnia and Carrignabinnia.

The range was historically named Sliabh gCrot (the hump mountains), anglicised as "Slievegrot"; or Crotta Cliach (the humps of Cliú), after the territory of Cliú.

The summit of Galtymore is marked as Dawson's Table, named after the Dawson-Massey family who were large landowners in the area (Tipperary Directory 1889), owning much of the land on and around the north section of the Galty range.

The area also originated Kerry Group's popular bacon food brand Galtee; and the term Galtee Mountains is still in common use.