NGC 3535 is an unbarred spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 7289 ± 25 km/s, which corresponds to a Hubble distance of 107.51 ± 7.54 Mpc (∼351 million light-years). It was discovered by German-British astronomer William Herschel on 18 April 1784.

According to the SIMBAD database, NGC 3535 is a radio galaxy.

One supernova has been observed in NGC 3535: SN 2023hrn (type Ia, mag. 18.4) was discovered by ATLAS on 8 May 2023.

• List of NGC objects (3001–4000)

• Media related to NGC 3535 at Wikimedia Commons
• NGC 3535 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images