梅根·里德利，原名赖利，是南方公园小学的一位四年级女学生。她由阿普莉尔·斯图尔特，首次出现在第十二季的“超欢乐时光”中。
背景
她第一次有台词是在“鸡鸡风波”当中，兰迪·马什在教班上的同学丁丁的尺寸，让她大声读出他的计算方法。
她后一次拥有台词是在“屁股汉堡综合征”当中，她在学校走廊上品尝了卡特曼的汉堡，对于其美味程度感到惊讶。
在“屁股汉堡综合征”中，她原本叫做莱莉，但是在“回忆之莓”中，她被重新命名为里德利。
外观
她有一头灰色的卷发。她穿着一件蓝领子的蓝绿色衬衫，一条深蓝色的裤子，一双黑色的鞋子。她的头上系着两个蝴蝶结。
个性
在“鸡鸡风波”中，她似乎很反对讨论露骨的丁丁长度公式，兰迪不得不又给她讲了两遍，但以她的年纪以及性别来看，反对也是正常的。
出场
- "超欢乐时光" - Seen holding hands with Jenny Simons; she was also one of the hostages.
- "歌舞童年" - She is seen watching boys sing at the end.
- "The Ring" - She is seen in the hallway as well as the Jonas Brothers' concert.
- "Fishsticks - Seen in in the school's hallways with Boy with Blond Hair.
- "HUMANCENTiPAD" - She was one of the kids Cartman mocks for not having an iPad.
- "T.M.I." - Appears in the 4th grade classroom when Randy Marsh taught teaching the class the "adjusted penis size" formula.
- "Ass Burgers" - Kyle offers her a hamburger; her name is revealed.
- "Jewpacabra" - Seen at the Easter egg hunt.
- "Butterballs" - Seen in the background at the school assembly.
- "Cartman Finds Love" - Seen in the background in the school cafeteria.
- "Let Go, Let Gov" - Seen in the playground.
- "Go Fund Yourself" - Seen in the background on the school bus.
- "Gluten Free Ebola" - Seen in the background shunning the boys.
- "Cock Magic" - Seen in the background of Mr. Garrison's class.
- "Member Berries" - Sits down during the volleyball game during the national anthem . She is renamed as "Meagan Ridley".
- "Skank Hunt" - Seen in the school's library. Seen taking a breakup letter to her boyfriend.
- "Wieners Out" - Seen at the volleyball game when the boys begin their Wieners Out movement during the national anthem.
- "Douche and a Danish" - Seen in the battle between the girls and the boys.
- "Put It Down" - Comforts to Beth crying after Gary got hit and killed by a car.