Newport Bay may refer to:

In the north, Newport Bay was formed by the Santa Ana River switching its course to the south, cutting across the northern part of the range.

Newport Bay has also been known as Mobjack Bay.

Until 1862, the Newport Bay flowed directly into the Pacific Ocean.

An abundance of plants have taken root in Newport Bay.

Newport Bay is one of the top birding sites in the United States, as there are over 200 bird species that have made their homes here.

Newport Bay is divided by the Pacific Coast Highway bridge, which is too low for most sailboats and very large boats to pass under.

South of the bridge is commonly called Lower Newport Bay, or Newport Harbor.

There are about 80 fishable fish located in Newport Bay.

Commercial fishing is also prominent in offshore Newport Beach and Newport Bay.