MA-1 may refer to:

• Bennett MA-1 ventilator, a powerful medical ventilator to assist respiration
• Fire control system used on the F-106 interceptor
• MA-1 bomber jacket, a nylon flight jacket
• MA-1 rifle, a variant of the EMERK K-3 rifle
• U.S. Route 1 in Massachusetts
• The abbreviation for Massachusetts's 1st congressional district
• Mercury-Atlas 1, a test flight of Project Mercury

• Brett Youngberg
• Brett Young (disambiguation)
• Brett’s law
• Bret v JS
• Bret v js
• Bret Walker
• Bret walker
• Bret Wallach
• Bretx
• Bretylan
• Bret Young
• Bretz (disambiguation)
• Bretz Mill
• Bretz Mill, California
• Bretzville
• Bretzville, IN
• Bretzville, Indiana
• Bretz, West Virginia
• Breu Branco
• Breuches
• Breuchotte
• Breuci
• Breuddwyd Macsen Wledig
• Breuer-Hering reflex
• Breugnon