Telus Harbour, formerly Telus House, formerly Union Tower, is a 30-storey office skyscraper at 25 York Street, on the south side of the traditionally defined financial district of Toronto, Ontario, Canada. Anchor tenant Telus will occupy 60 percent of the rentable area.

The building is located at the corner of York Street and Bremner Boulevard, the former brownfield railway lands, just south of Union Station. Telus Tower is connected to the Toronto PATH network of underground pedestrian passageways. The building is visible from the Toronto Waterfront and is one of the many new developments in the area, including the Scotiabank Arena, Maple Leaf Square, and Infinity Condominium.

The development is pursuing Leadership in Energy and Environmental Design (LEED) gold status for the project's environmental sustainability.

The project was managed by Menkes Development Ltd., Alcion Ventures and HOOPP Realty Inc. and was built by architecture firms Sweeny&Co Architects Inc. and Adamson Associates as lead architects.

• Telus
• Dye & Durham
• President's Choice Financial (President's Choice Bank)

• Toronto Harbour

• Media related to Telus House at Wikimedia Commons
• Menkes Official Page
• Telus Release
• Toronto Star coverage of worker death