The far-right politician intends to take three members of his family to the event in his capacity as an MEP for the North West.
Last year Mr Griffin withdrew from attending a similar event out of fear of embarrassing the Queen.
A Buckingham Palace spokesman confirmed that as an MEP Mr Griffin was eligible to nominate himself to attend a garden party, as part of the allocation of tickets to the European Parliament.
In 2009 Mr Griffin was invited to attend a Buckingham Palace garden party by his BNP colleague Richard Barnbrook who, as a London Assembly member, was nominated for two tickets by the Greater London Authority (GLA).
He bowed out of the event following a wave of public protest.
ITN News