Lasse Pirjetä (born April 4, 1974) is a Finnish former professional ice hockey forward.

He represented several teams in the Finnish SM-liiga, Frölunda HC in the Swedish Elitserien and the Columbus Blue Jackets and Pittsburgh Penguins in the NHL.

Pirjetä spent the majority of his first nine years of his professional career playing in his native Finnish league the SM-Liiga.

After nominating, Pirjetä was selected by the Columbus Blue Jackets as their fifth-round pick, 133rd overall, in the 2002 NHL Entry Draft, as an overage draftee.

Pirjetä made the jump to the NHL immediately in 2002–03 season with the Blue Jackets, appearing in 51 games with a solid 21 points.