Leonard Sidgwick Howell (6 August 1848 – 7 September 1895) was an English footballer who won the FA Cup with the Wanderers in 1873 and made one appearance as a full back for England in the second international match.
Howell was born in Herne Hill and educated at Winchester College whom he represented at various sports, including "soccer", cricket and athletics, winning the 100 yds, 300 yds and 110 yds hurdles in 1866.
After leaving the college, he joined the Wanderers and helped them retain the FA Cup which they had won the previous year. Under the competition rules, Wanderers were given a "bye" to the final, where they met Oxford University at Lillie Bridge on 29 March 1873. In the early stages of the final, Oxford "made the running... with Howell and Thompson performing admirably in the Wanderers defence to keep the University students at bay". Despite the students' efforts, Wanderers won the game 2–0, and thus retained the trophy. This was Howell's first match for the Wanderers; he is, thus, one of the few players to have made his debut in an FA Cup Final.
His solitary appearance for England had come three weeks before the Cup Final, in the second international match against Scotland played at Kennington Oval, London on 8 March 1873. England selected a side with a strong Wanderers influence, including Charles Chenery, Robert Vidal, Alexander Bonsor, William Kenyon-Slaney and Hubert Heron. England won the match 4–2.