M&R Hotel Management M3 Accounting + Analytics
  M3 Hotel Accounting Macdonald Hotels
  Madigan Pratt Maestro PMS
  Magnuson Hotels Magnuson Worldwide
  Mainstay Mainzer Consulting Group LLC
  Majestic Properties Malibu Beach Inn
  Malmaison Mandalay Bay
  Mandarin Oriental Manpower
  ManpowerGroup Mantra Group
  Manugistics Group Marco Beach Ocean Resort
  Marco Polo Hotels Marcus & Millichap
  Marcus Hotels Margaritaville
  Maritim Hotels Maritz
  Maritz Research Market Metrix
  MarketResearch.com Marpac
  Marquis Reforma Marra
  Marriott Marriott International
  Marshall Hotels Marshall Management
  Marti Group Massport
  Maxim Hotel Brokerage Maxim Revenue Management Solutions
  Maybourne Hotel Group McDonald's
  MCR Development Mediapost
  Meeting Evolution MeetingMart
  MeetingMatrix MeetingRoomNow.com
  Meetings Industry Association Meetingsbooker.com
  MeetingSource.com MEININGER Hotels
  Meisel Holdings Meliá Hotels
  Memories Resorts Mention Me
  Meraas Mereté Hotel Management
  MeriStar Meritage Hospitality Group
  Meritus Hotels Metamend
  Metime.com Mexico Tourism Board
  Mexinews Meyer & Associates
  Meyer Jabara MGM Hospitality
  MGM MIRAGE MGM Resorts International
  MHI Hospitality Corporation MICEpoint
  Michigan State University Micoley.com
  Microsoft Microtel
  Migis Hotel Group Milestone Hospitality International
  Milestone Internet Marketing Millennium Hotels
  Minor Hotel Group Mintek
  Mintel Minute Suites
  Miramar Miraval
  MIS Computer Corporation Mise en Place
  MJS MKG Hospitality
  Mobil Travel Guide Mobile Media Applications
  Modus Hotels Moe's Southwest Grill
  Mohegan Sun Molinaro Koger
  Monarch Casino & Resort Monarch Cypress
  Montage Hotels MOON Resort
  Morgans Hotel Group Morongo Casino Resort and Spa
  Morton’s Mosaic Hotel Group
  Moscow Times Mosquito Genie
  Motel 6 Motto by Hilton
  Mount Meru Hotel Mountain China Resorts
  Moxy Hotels MP&A Digital & Advertising
  MPI MR&H
  MSC Cruises MSNBC
  MTech MultiCultural Foodservice & Hospitality Alliance
  MUSE MustHaveMenus
  MVI Systems MVP Commercial
  My Break Trip mycloud Hospitality
  Myriad Myrtle Beach Area Hospitality Association
  MyWebsite Promotions Mövenpick