Xar may refer to:

• Xar (graphics), a file format used with vector graphics
• XAR, a file archiver and its associated file format
• Michael Portnoy, who uses the stage name XAR
• The ICAO Code for Travel Express Aviation Services, Indonesia

• Ohio valley electric railroad
• Ohio Valley Electric Railway
• Ohio Valley Electric Railway Company
• Ohio Valley Filk Fest
• Ohio Valley Filk Festival
• Ohio Valley in Kentucky
• Ohio Valley Redcoats
• Ohio Valley Yearly Meeting
• Ohio v. Dalton
• Ohio village
• Ohio Village
• Ohioville
• Ohio Virtual Academy
• Ohio v. Roberts
• Ohio v. Robinette
• Ohiowa
• Ohio War
• Ohio-wesleyan
• Ohio Wesleyan Battling Bishops
• Ohio Wesleyan Sweetly and Strong
• Ohio Wesleyan University Library
• Ohio Western Reserve National Cemetery
• Ohio wineries
• Ohio Writing Project (OWP)
• Ohio Xoggz