Anti-terror patrols in London are costing the Metropolitan Police more than £1m a month.
Policing US President George Bush's visit cost nearly £4m
Between 26 March and 31 December 2003, more than £10m was spent on "high visibility" patrols, according to police figures.
Security was stepped up after the war on Iraq began because of fears of a terrorist attack on a major landmark.
The Notting Hill Carnival remains the single most costly event to police, with a bill of £5,781,994.
A report to the Metropolitan Police Authority (MPA) said anti-terror policing to provide "reassurance and reinforce existing security arrangements" was continuing.
The bill for putting 5,681 officers at Heathrow Airport last February, when troops and tanks were also called in amid fears of an imminent terror attack, stood at £2,325,781.
All the Iraq or terrorism-related events, including demonstrations, visits by foreign leaders and the Docklands arms fair, cost the force about £25m last year.
Meanwhile David Blaine's starvation stunt at Tower Bridge, cost £70,844 - half the cost of a subsequent Tower Bridge protest by a father's rights campaigner.