John Sims Reeves (21 October 1821 – 25 October 1900) was an English operatic, oratorio and ballad tenor vocalist during the mid-Victorian era. Reeves began his singing career in 1838 but continued his vocal studies until 1847. He soon established himself on the opera and concert stage and became known for his interpretation of ballads. He continued singing through the 1880s and later taught and wrote about singing.