M · 60
- M. D. Gunasena & Co. (Pvt) Ltd1255
- M.S.A. Nazar1
- Maanu Graphics12
- Maclehose Press16
- Macmilan India Ltd Ltd2
- Macmillan56
- Macmillan Childrens Books7
- Macmillan Education1
- Macmillan Education India Private Limited7
- Macmillan Group5
- Macmillan India5
- Madhawa Prakashana1
- Magpie Books Ltd11
- Mahamegha Publishers37
- Maheshakya Prakashakayo1
- Majestic Book Club7
- Makeen Books, Tula Publishing Ltd1
- Makkmilan Book Depot1
- Malalasekera Foundation1
- Maldewata Publication1
- Malithi Batithi Publication1
- Mallawaarachchi Prakashakayo5
- Mallawaarachchi Publishers3
- Malpiyali Prakashana11
- Malpiyali Publishers55
- Mama House Of Publishing2
- Mammoth7
- Mana Prakashana1
- Mango Publishing1
- Manilla Press8
- Manjul Publishing House20
- Manoj Publications54
- Mantle8
- Mariner4
- Martins Griffing1
- Masitha Prakashakayo9
- Masitha Publishers26
- Master Guide Publication89
- Mathaka Publishers12
- Mayuro Book Publishers3
- McGraw Hill1
- Merky Books1
- Michael Joseph8
- Michael O`Mara Books Limited3
- Miles Kelly Publishing1
- Mills & Boon4
- Minas Publication25
- Minie Publication1
- Minsara Prakashana3
- Minsara Publishers4
- Mira Books1
- Mishkath Research Institute1
- Moden Poth Samagama9
- Modern Publishers12
- Moonlight Publications2
- Moradanage Book Publishers4
- MT Grafix1
- Multi Book Shop(Saranga Publishers)1
- Muses Publisher20
- Muses Publishing House (Pvt) Ltd55