Racial tension was stirred after more than 1,000 Muslim families were due to attend a private event at the resort in Windsor, Berkshire, on Sunday.
The attraction received threatening phone calls, emails and social media posts for being hired exclusively by the Muslim Research and Development Foundation.
Legoland decided to cancel the event last week following talks with the organisers and Thames Valley Police, and officials have now decided to shut the 150-room hotel this weekend as they cannot guarantee the safety of their staff or guests.
A spokesman said: “Unfortunately the Legoland Windsor Resort has had to close the Hotel on Saturday 8th and Sunday 9th March 2014 after threats from right-wing groups made against the Resort.
“The Hotel closure follows the cancellation of a private event that was due to take place on Sunday 9th March prior to the Theme Park reopening for the 2014 season on Friday 14th Match.
“We are extremely sorry that we’ve had to cancel guest bookings and whole heartedly understand the disappointment of those families that will be unable to attend, particularly as we haven’t been able to give them more notification because of the dynamic nature of this situation.
“The safety and security of our guests and our members of staff is our number one priority, which is why we’ve made the difficult decision to close the Hotel. All guests that were booked in to stay will be given a full refund.”
The theme park itself was always planned to be closed to the public this weekend and will reopen for the 2014 season on March 14, a spokesman said.
Before the fun day was cancelled, a British National Party blogger said Legoland should be “ashamed of themselves for bowing to these Muslims”. The blog added: “This is disgusting and should NOT be allowed to go ahead.
“If someone would organise a white Christian-only day, people would be up in arms, calling them racist and God knows what, but no one says a thing when it’s Muslims.”
A picture of a Muslim Legoland worker was also posted on Facebook along with an offensive comment, a spokesman for the attraction said.
The Muslim Research and Development Foundation is run by Haitham al-Haddad, an Islamic scholar accused of spreading ideological hatred who has been banned from a number of universities because of his extremist views.
It is believed that members of the English Defence League and the neo-Nazi linked Casuals United had threatened to target the park.
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From the “conservative” Telegraph.