Aberdeen & North East Scotland:
First Aberdeen - run all local services within the city of Aberdeen
Stagecoach - Stagecoach Bluebird services across the North East of Scotland

Edinburgh & the Lothians:
Lothian Buses - provide most services in the city of Edinburgh
First Edinburgh - provide most services across the rest of the Lothians

Dundee, Fife, Perth:
Travel Dundee - local services within Dundee
Stagecoach - Fife
Stagecoach - Perth

Glasgow & the West of Scotland:
First Glasgow - provide most local services in Glasgow
Stagecoach - services across Ayrshire, Glasgow and the West of Scotland
Arriva - services in Glasgow & the West of Scotland
Strathclyde Passenger Transport (SPT) - run Glasgow Subway, provide subsidised bus services, etc.

Inverness & the Highlands
Rapsons - Inverness-shire, Speyside, the Highlands, Caithness

Northern Isles
Orkney public transport timetable

Western Isles
Western Isles bus services

Miscellaneous others
See Traveline site for other bus timetables in Scotland

Scottish Citylink Coaches are the principal coach operator for services within Scotland.

National Express run long-distance coach services from Scotland.

First ScotRail run the majority of services within Scotland & the Caledonian Sleeper services to London

GNER is the main operator on the East Coast Main Line (Edinburgh-York-London King's Cross)

Virgin Trains is the main operator on the West Coast Main Line (Glasgow-Birmingham-London Euston) and for Cross-Country services (South-West & South Coast of England-Birmingham-Scotland)

Network Rail's on-line journey planner provides information on rail journeys within the UK. Some people prefer to use Die Bahn's journey planner (in English) - this site can also be used to plan international rail journeys.

The Train Line - online booking service

Caledonian MacBrayne - run most Hebrides & Clyde services

Northlink Ferries - run services to Orkney & Shetland

Eurostar - operates high-speed rail services from London Waterloo to Paris & Brussels

Rail Europe - sells rail tickets from London to destinations across Europe

To Ireland:

Seacat - run ferries from Troon-Belfast

Stena Line - run ferries from Stranraer-Belfast, Heysham-Isle of Man & Liverpool-Dublin

P&O Irish Sea Ferries - Troon/Cairnryan-Larne & Liverpool-Dublin

To the continent:

Superfast Ferries - service from Rosyth-Zeebrugge (Belgium)

Brittany Ferries - ferries from Portsmoth, Poole & Plymouth to France & Spain

P&O Ferries - ferries from Hull, Dover & Portsmouth to the Spain, France, Belgium & The Netherlands

Stena Line - ferries from Harwich to The Netherlands