M198 or M-198 may refer to:

• M198 howitzer, a medium-sized, towed artillery piece
• M-198 (Michigan highway), a former state highway in Michigan

• The Adventures of Batman and Robin
• The Adventures of Bayou Billy
• The Adventures of Brisco County Jr.
• The Adventures of Brisco County, Jr.
• The Adventures of Buckaroo Banzai
• The Adventures Of Buckaroo Banzai Across The 8th Dimension
• The Adventures of Buckaroo Banzai Across the 8th Dimension
• The Adventures of Buckaroo Banzai Across the Eighth Dimension
• The Adventures of Captain Comic
• The Adventures of Captain Underpants
• The Adventures of Champion (TV series)
• The Adventures of El Ballo
• The Adventures of Elmo in Grouchland
• The Adventures of Fartman
• The Adventures Of Ford Fairlane
• The Adventures of Ford Fairlane
• The Adventures of Gulliver
• The Adventures of Harry Lime
• The Adventures of Huckleberry Finn
• The Adventures of Ichabod and Mr. Toad
• The Adventures of James Bond Junior 003½
• The Adventures of Jimmy Neutron
• The Adventures Of Jimmy Neutron: Boy Genius
• The Adventures of Jimmy Neutron: Boy Genius
• The Adventures of Jonny Quest