The premetro and tram route 3 in Brussels, Belgium, was operated by STIB/MIVB, and connected the Esplanade stop (on the borders of Neder-Over-Heembeek in Laeken in the City of Brussels and Strombeek-Bever) with the Churchill stop in the southern municipality of Uccle. The line was named after the planned Metro line 3, which is set to service most of the former route of tram line 3. The colour of the signage for this line was lime-green.
On 23 September 2024, the line was permanently disbanded, with most of its route being taken over by the new line 10. A further tram line 35 was established, taking over the Esplanade–Van Praet portion of line 3 and continuing on to a new terminus at Bienfaiteurs/Weldoeners.