Princess Louisa Inlet, Marine inlet in British Columbia, Canada.

Princess Louisa Inlet is a marine arm in British Columbia that extends roughly six kilometers inland, bordered by steep granite cliffs that drop sharply into deep waters. Multiple waterfalls cascade directly into the sea at its northern reaches.

In June 1792 George Vancouver reached the entrance but did not enter because the tide was ebbing through Malibu Rapids. In 1860 Captain George Richards surveyed and mapped Jervis and Princess Louisa Inlets, naming them and surrounding features, while Commander Richard Charles Mayne explored the valley at the head of the inlet hoping it led inland.

The inlet is called swiwelat in she shashishalhem, the language of the shíshálh Nation, whose village of asxwikwu stood at its mouth. The English name may honour Princess Louise, daughter of Queen Victoria, though some trace it to Victoria's mother, born Mary Louise Victoria; the source remains uncertain.

The passage through Malibu Rapids at the inlet's entrance demands careful timing, as currents accelerate to roughly nine knots during spring tides through the narrow channel. Travelers should study tide schedules and local conditions before attempting the crossing.

James Bruce Falls and Chatterbox Falls pour glacial meltwater into the inlet, with both cascades visible from boats throughout the year regardless of season. This constant cold-water source creates a dynamic visual backdrop that shifts with weather and light.