Smalls Lighthouse is a lighthouse that stands on the largest of a group of wave-washed basalt and dolerite rocks[3][4] known as The Smalls approximately 20 miles (32 km) west of Marloes Peninsula in Pembrokeshire, Wales, and 8 miles (13 km) west of Grassholm.

When Whiteside visited the lighthouse in 1777, he was stranded for a month by gales which showed no sign of abating so that supplies were almost exhausted.

When Griffith died in a freak accident, Howell feared that if he discarded the body into the sea, authorities might accuse him of murder.

[10] As Griffith's body began to decompose, Howell built a makeshift coffin for the corpse and lashed it to an outside shelf.

In spite of his former partner's decaying corpse and working the lighthouse alone, Howell was able to keep the house's lamp lit.

[15] The new lighthouse was designed by James Walker, Engineer-in-chief at Trinity House, with Douglass serving as chief engineer.

The lighthouse's story was presented in the 2006 BBC Television programme Coast, Series 1, episode "Bristol to Cardigan Bay".

In 1837, the American Captain Thomas Hubbard Sumner discovered the concept of celestial position lines—the circle of equal altitude—as he was approaching Smalls Lighthouse in thick weather.