Pen Pumlumon Llygad-bychan

{{Short description|Mountain (727m) in Ceredigion, Wales}}

{{Use dmy dates|date=April 2022}}

{{Infobox mountain

| name = Pen Pumlumon Llygad-bychan

| photo =

| photo_caption =

| elevation_m = 727

| elevation_ref =

| prominence_m = 36

| parent_peak = Pen Pumlumon Fawr

| listing = Hewitt, Nuttall

| language = Welsh

| location = Ceredigion, Wales

| range = Cambrian Mountains

| coordinates = {{coord|52.4691|-3.7694|type:mountain_region:GB|display=inline,title}}

| grid_ref_UK = SN799871

| topo = OS Landranger 135

| easiest_route =

}}

Pen Pumlumon Llygad-bychan is a subsidiary summit of Pen Pumlumon Fawr and the third highest summit on the Plynlimon massif, a part of the Cambrian Mountains in the county of Ceredigion, Wales. It is not named on Ordnance Survey walking maps.

The summit is boggy, and is marked by a few stones. The views include Rhos Fawr, Drygarn Fawr, Pen y Garn to the south and Aran Fawddwy, Glasgwm, Tarrenhendre and Tarren y Gesail to the north.

The River Wye, has its source just south of the summit. The glacial lake of Llyn Llygad Rheidiol lies to the north.Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. {{ISBN|1-85284-304-7}}.