Ten people were given fixed penalty notices after officers were called to a report of people gathering at a property in Gregory Avenue, Lenton, at 2.15am today.
Four of those fined had their penalties increased to £400 for being repeat offenders.
Officers found a buffet, a poker table and bottles of alcohol at the gathering.
Superintendent Ted Antill, of Nottinghamshire Police, said: “The vast majority of people in Nottinghamshire who have been making great sacrifices to follow the national lockdown legislation will be rightly appalled at the behaviour of this minority of people who are carrying on regardless.
“The lockdown legislation doesn’t allow mixing indoors with people you don’t live with or have a support bubble with, so for people to gather is blatantly flouting the law and there is no excuse for it.
“Covid-19 thrives where there is social contact and while the NHS continues to be under such pressure, large gatherings continue to pose a significant risk to public health.
