Football was the overall winner in the attendance stakes at 43.4 million, while three of the 10 best attended showpieces were horseracing events.
Rugby union attendances, boosted by the 2.5 million fans at the Rugby World Cup, climbed to 7.5 million.
This year's total was less than the 75 million at UK sports events in 2012.
However, that year was boosted by 11 million visitors to the Olympic and Paralympic Games in London.
Excluding the Rugby World Cup, the 10 most popular individual sporting events of 2015 had a combined attendance of 2.5 million, with Wimbledon topping the list again.
The tennis tournament attracted just under half a million spectators during the fortnight.
In terms of attendees-per-event-day, Formula 1's British Grand Prix was the winner, averaging more than 100,000 per day.
Referring to the popularity of horseracing events, Alan Switzer, director in Deloitte's sports business group, said: "British racecourses are on track for record attendances of 6.2 million in 2015.
"Flagship events such as Royal Ascot, the Cheltenham Festival and the Epsom Derby are firmly established in the top tier of best-attended annual UK sporting events, whilst the breadth and depth of other meetings throughout the year ensure horseracing remains one of the UK's most popular spectator sports."
Two new individual events entered the top 10 best-attended sporting events in 2015: MotoGP's British Grand Prix (154,000) and the Badminton Horse Trials (147,000).
These events replaced the Ryder Cup and Aintree Grand National from 2014.
Deloitte said that although overall attendances for the year fell short of the record of 75 million set in 2012, taking away the one-off effects of the Olympic and Paralympic Games that year, and the Rugby World Cup in 2015, attendances rose by 6% across the period.
Major sporting events in the UK next year include the UCI Track Cycling World Championships, the European Aquatics Championships and the FIH Women's Champions Trophy in hockey.

The Muslim Council of Britain (MCB) said mosques would offer refreshments and "insight" into how they run.
Leaders from other religions have also been invited, to "demonstrate unity".
The MCB has raised concerns about anti-Muslim sentiment since 17 people were killed by Islamist militants in Paris last month.
Announcing Visit My Mosque Day, the MCB said: "Mosques will be sharing tea and refreshments alongside an insight into the day-to-day goings on of a busy Muslim centre of worship.
Members of the Muslim community "may be on hand to answer questions about Muslims and Islam where this is possible," it said.
"Local mosques will also be inviting inter-faith leaders as well, and all will be invited to come together to demonstrate unity and solidarity during what has been a tense time for faith communities."
Speaking outside the East London Mosque in Whitechapel, MCB assistant secretary general Miqdaad Versi said the organisation wanted to "de-mystify what Islam, Muslims and mosques are all about".
"People can have the opportunity to understand these things directly from people that they can speak to, and by actually experiencing these institutions and coming into mosques they can break down the barriers that they previously had," he said.
Mr Versi said there had been a rise in "Islamophobia" since the Paris killings, with attacks on three or four mosques, more verbal attacks against Muslims and "a lot more hate mail" being received by the MCB.
"For us it's important to try and create a positive image, and not let the actions of a few impact the reality of the many," he added.
The Reverend Fred Ashford-Okai, one of those who visited East London Mosque earlier, said: "The more we know about each other - Muslims, Christians, Jews, even those with no faith - the more we can actually live a more cohesive life in our community."
More than 20 mosques were expected to take part.
The figure is a small proportion of the total number of mosques in Britain, which is estimated to be 1,750.
The MCB said only 55-60% of mosques were affiliated to it, and the total includes small establishments such as prayer rooms in schools and offices.
Attendances at professional sports events in the UK topped 70 million this year, up 5% on 2014, according to Deloitte's sports business group.
[NEXT_CONCEPT]
Mosques have opened their doors to the public as part of a drive to "reach out to fellow Britons following tensions around terrorism".