Adams
    1903-1906

Ailsa
    1968, 1973-1979
    Alisa Trucks Ltd
    Glasgow

AJS
    1927-1931
    A J Stevens & Co Ltd
    Wolverhampton, Staffordshire

Albany
    1973-
    Albany Motor Carriage Co
    Cristchurch, Dorset

Albion
    1912-1972
    Albion Motor Car Co
    Glasgow

Albion/Mann-Egerton
    1956
    British Aluminimun Co
    Providence, Rhode Island

Allan Taylor
    1927-1959
    Allan Taylor Engineering & Machinery Co Ltd
    Lontoo SW18

Allchin
    1905-1931
    William Allchin & Co Ltd
    Northampton

Allen
    1958-1972
    John Allen & Sons Ltd
    Oxford

Alley&McLellan
    1906-1917
    Alley & McLellan Ltd
    Glasgow, Skotlanti

Alvis
    1952-
    Alvis Ltd
    Coventry

Alvis-Berliet
    1964-n. 1968
    Alvis Ltd ja Automobiles M Berliet SA

Alvis
    1935-n. 1939
    Alvis Ltd
    Coventry

Annis
    1958-1959
    Annis & Co Ltd
    Middlesex

Argyle
    1970-n. 1973
    Argyle Motor Mfg Co Ltd
    East Kilbridge, Lanarkshire, Skotlanti

Argyll
    1906-1914
    ARgyll Motors Ltd
    Glasgow

Ariel
    1911-1912

Armstrong-Saurer
    1931-1937
    Armstrong-Saurer Commercial Vehicles Ltd
    Newcastle-upon-Tyne

Armstrong-Siddeley-Pavesi
    1927-1932
    Armstrong Siddeley Motors Ltd
    Coventry

Armstrong-Whitworth
    1906-1914
    Motor Omnibus Construction Ltd
    Lontoo NE

Arran
    1934-1937
    Arran Motors Ltd
    Welwyn, Garden City, Hertfordshire

Arrol-Johnston
    1905-1915
    Mo-Car Syndicate Ltd
    Glasgow

ASI
    1982-
    Andrew Stewens Industrial Ltd
    Essex

Atkinson
    1916-1970
    Atkinson & Co
    Preston, Lancashire

Atkinson & Phillipson
    n. 1905

Austin (I)
    1919-1968
    Austin Motor Co Ltd
    Birmingham

Austin (II)
    1961-1968
    British Motor Corp Ltd
    Bathgate, West Lothian

Austin-Electricar
    1948-1968
    Austin Crompton Parkinson Electric Vehicles Ltd
    South Wington, Leicestershire

Austin-Morris
    1970-n. 1978
    British Leyland (Austin-Morris) ltd
    Birmingham

Auto-Electric
    1935-1939

Atkey-Gimson
    1905-1908
    A R Atkey & Co Ltd ja Gimson & Co
    Nottingham

Atlas (II)
    1910
    Martins Motor Ltd
    Lontoo

Attila
    1905
    Hunslet Engine Co Ltd
    Leeds, Yorkshire

Auto-Tractor
    1933-1947
    Auto-Mower Engineering Co Ltd
    Norton St Philip, Bath, Somerset

Aveling
    1908
    TC Aveling & Co
    Birmingham

Aveling & Porter
    1909-1925
    Aveling & Porter Ltd
    Rochester, Kent

Aveling-Barford
    1939-
    Aveling-Barford Ltd
    Grantham, Lincolnshire

Avonside
    1913
    Avonside Engine Co Ltd
    Bristol

AVS
    1975-
    Advanced Vehicle Systems Ltd
    Welwyn Garden City, Hertfordshire

AWD
    1958-n. 1966
    All-Wheel Drive Co Ltd
    Camberley, Surrey