[3] She married fellow engineer Pierre Lassonde, and they had two children: daughter Julie and son Christian.

She was on the board of Enghouse Systems Limited, AGF Group of Funds, Abitibi-Price, Clearnet Communications and Aeterna Laboratories.

[9] The Claudette-MacKay-Lassonde Pavilion at Western University in London, Ontario is so named after a financial gift to fund the construction.

[10][4] In 2021, the Claudette MacKay-Lassonde Scholarship was established at the Pierre Lassonde School of Fine Arts at Mount Allison University.

The award is named in honour of MacKay-Lassonde — who beyond being an advocate for opportunities for women in engineering, was also a lover of fine arts and a painter herself.