Lead counsel Mohamed Mbabazi said laptops, computers and documents were taken from his office.
The lawyers are representing Uganda’s former Prime Minister Amama Mbabazi who wants the election results annulled.
Local and international observers criticised the election process which saw Mr Museveni win 60% of the vote.
Lawyers were in the process of gathering witness evidence for the petition against the election result when they were burgled.
Mr Mbabazi, who was standing for president, is claiming voters were bribed and people were arrested during the vote.
Main opposition candidate Kizza Besigye was detained by police multiple times throughout the campaign, vote and during the count.
Mr Mbabazi’s lawyers are due to present their case to the Supreme Court Justices by Sunday.
Source: 3news.com|Ghana