Maria Teresa Merlo (20 February 1894 - 5 February 1964) - in religious life "Tecla" - was an Italian Roman Catholic professed religious and the co-founder of the Daughters of Saint Paul that she established alongside Blessed Giacomo Alberione.
Merlo was an extensive writer and traveler as she penned articles for her order and made visits across the world to communities that were established in nations such as the United States of America and Australia.The beatification process commenced in the 1960s though the formal introduction of the cause was initiated in 1982.
Pope John Paul II conferred the title of Venerable upon her in 1991 after confirming that she had lived a model life of heroic virtue.