Officials said the fire broke out around 9:15 p.m. at The Preserve at Owings Crossing apartment complex in the 100 block of Caraway Road.
Firefighters said flames were shooting through the roof of the building when they arrived and they requested a second alarm.
When firefighters first arrived on the scene, they noticed heavy fire and called for a second alarm.
Firefighters rescued seven people and a dog from the second and third floors of the building. Officials said 10 people were injured. Four of those people were taken to area hospitals for treatment of non-life-threatening injuries. No firefighters were injured while fighting the fire.
The fire was brought under control at 9:51 p.m.
Fire investigators determined that the fire was accidental and was caused by a candle that had fallen over in a second-floor apartment. About 12 apartments were damaged.
The Red Cross has assisted as many as 36 displaced residents.
Investigators are estimating the damages to be $200,000 to the building and $75,000 to the contents of the building.
Officials said about 39 pieces of Baltimore County Fire Department equipment and 75 firefighters were assigned to the call.