阿佛烈·丁尼生，第一代丁尼生男爵（Alfred Tennyson, 1st Baron Tennyson，1809年8月6日－1892年10月6日），是华兹华斯之后的英国桂冠诗人，也是英国著名的诗人之一。

其子哈勒姆·丁尼生曾任澳洲总督。

英国19世纪的著名诗人，在世时就获得了极高的声誉。生于英国林肯郡，出身牧师家庭，兄弟均有诗才，肄业于剑桥大学，诗作题材广泛，想象丰富，形式完美，词藻绮丽，音调铿锵。其131首的组诗《悼念》被视为英国文学史上最优秀哀歌之一，因而获桂冠诗人称号。其他重要诗作有《尤利西斯》、《伊诺克·阿登》和《过沙洲》诗歌《悼念集》等。 他深受维多利亚女王的赏识，于1850年获得了桂冠诗人的称号，后来又在1884年被封为男爵。然而，这样一位大诗人也有对自己丧失信心的时候，竟曾经想删去自己诗作中的精华部分。

Alfred Tennyson, 1st Baron Tennyson, FRS (6 August 1809 – 6 October 1892) was Poet Laureate of Great Britain and Ireland during much of Queen Victoria's reign and remains one of the most popular British poets.

Tennyson excelled at penning short lyrics, such as "Break, Break, Break", "The Charge of the Light Brigade", "Tears, Idle Tears" and "Crossing the Bar". Much of his verse was based on classical mythological themes, such as Ulysses, although In Memoriam A.H.H. was written to commemorate his friend Arthur Hallam, a fellow poet and student at Trinity College, Cambridge, after he died of a stroke aged just 22. Tennyson also wrote some notable blank verse including Idylls of the King, "Ulysses", and "Tithonus". During his career, Tennyson attempted drama, but his plays enjoyed little success. A number of phrases from Tennyson's work have become commonplaces of the English language, including "Nature, red in tooth and claw" (In Memoriam A.H.H.), "'Tis better to have loved and lost / Than never to have loved at all", "Theirs not to reason why, / Theirs but to do and die", "My strength is as the strength of ten, / Because my heart is pure", "To strive, to seek, to find, and not to yield", "Knowledge comes, but Wisdom lingers", and "The old order changeth, yielding place to new". He is the ninth most frequently quoted writer in The Oxford Dictionary of Quotations.