Penllergaer (Welsh: Penlle'r-gaer) is a village and community in the City and County of Swansea, Wales.

It is situated about 4.5 miles north west of Swansea city centre, near junction 47 of the M4 motorway.

It is active in gardening, conservation and maintenance, and operates a coffee shop on the grounds.

[2] During World War II, the estate was purchased by the missionary Rees Howells and the mansion was offered as a residence to the exiled Emperor Haile Selassie of Ethiopia.

[7] The nearby places are Garden Village, Gorseinon, Fforestfach, Llangyfelach, Grovesend, Pontlliw and Felindre.