小约翰·霍华德·加拉格尔（John Howard Gallagher Jr.，1984 年 6 月 17 日出生）是一位美国演员和音乐家，因在邓肯·谢赫和史蒂文·萨特的摇滚音乐剧《春之觉醒》中扮演莫里茨·斯蒂费尔一角而闻名，该剧为他赢得了托尼奖音乐剧最佳男主角奖。他还在绿日的百老汇音乐剧《美国白痴》中扮演约翰尼，在 2011 年百老汇制作的《耶路撒冷》中扮演李，在 2016 年百老汇复兴版的《长夜漫漫》中扮演埃德蒙。他在亚伦·索金（Aaron Sorkin）的电视剧《新闻编辑室》（The Newsroom）中饰演吉姆·哈珀（Jim Harper），出演了HBO迷你剧《奥利弗·基特里奇》（Olive Kitteridge），并在《克洛弗菲尔德巷10号》（10 Cloverfield Lane）中扮演埃米特·德威特（Emmett DeWitt）。

John Howard Gallagher Jr. (born June 17, 1984) is an American actor and musician known for originating the role of Moritz Stiefel in Duncan Sheik and Steven Sater's rock musical Spring Awakening, which earned him a Tony Award for Best Featured Actor in a Musical. He also played Johnny in Green Day's Broadway musical, American Idiot, Lee in the 2011 Broadway production of Jerusalem, and Edmund in the 2016 Broadway revival of Long Day's Journey Into Night. He portrayed Jim Harper in Aaron Sorkin's drama series The Newsroom, starred in the HBO mini-series Olive Kitteridge, and played Emmett DeWitt in 10 Cloverfield Lane.