- mangonel
- mangonize, to
- man-handle, to
- man-hole
- man-hunting
- manifest
- manilla rope
- maniple
- manœuvre
- man-of-war
- man-of-war bird
- man-of-war fashion
- man-of-war's man
- manometer
- man overboard!
- man ship!
- mansions of the moon
- mantillis
- mantlets
- manual-exercise
- manubalist
- manxman
- manzera
- mar
- marabut
- marches
- marching order
- marco-banco
- mare's tails
- margin line
- marinarius
- marinate, to
- marine
- marine barometer
- marine boards
- marine buildings
- marine clothing-room
- marine engines
- jeffrey's glue
- marine glue
- marine insurance
- marine lagoon
- marine officer
- mariner
- marine railway
- mariner's compass
- mariner's needle
- marines, the royal
- marine stores
- maritima angliæ
- maritime
- maritime country
- maritime interest
- maritime law
- maritime lien
- maritime positions
- maritime powers
- mark
- markab
- marks and deeps
- marl, to
- marle, to
- marline
- marline-holes
- marline-spike
- marline-spike hitch
- marmit
- maroon
- marooning
- marque
- marquee
- marrot
- marry, to, the ropes, braces, or falls
- mars
- marsh
- marsiliana
- mart
- martello tower
- martial law
- martin
- martinet
- martingale
- martnets
- maryn
- marynal
- mascaret
- mask
- mast
- mast-carlings
- mast-coat
- master
- master of a ship-of-war
- master and commander
- master-at-arms
- master-attendant
- master mariner
- master of misrule
- master of the fleet
- master-shipwright
- mast-head