Álvaro Guillén Meza (born 2 January 2003) is an Ecuadorian tennis player.

[2] Guillén Meza represents Ecuador at the Davis Cup, where he has a W/L record of 1–1.

[3][4] At 20 years old, Guillén Meza became the youngest Ecuadorian champion since Giovanni Lapentti in 2003 after winning the 2023 Lima Challenger.

[5] He won his second Challenger title at the 2024 Ibagué Open, defeating Facundo Mena in the final.

[6] This biographical article relating to Ecuadorian tennis is a stub.