Some witnesses reported hearing what sounded like an explosion either just before or near the start of the fire, which was reported just after 9 p.m. near the 14000 block of Marquesas Way.
One boat was fully engulfed in flames. It appeared a second adjacent boat was also damaged.
Fire destroys boat docked at Marina del Rey
Los Angeles County firefighters got the flames under control and no injuries were immediately reported.
The cause of the fire remains under investigation.