Manuel Alonso de Areizaga (12 November 1895 – 11 October 1984) was a Spanish tennis player.

In the early 1920s, Bill Tilden wrote about Alonso: "Seldom have I seen such wonderful natural abilities as are found in this young Spaniard [...] Alonzo has a terrific forehand drive that is the closest rival to W.M.

Such speed of foot and lightning turning I have never before seen on a tennis court [...] I look to see Alonzo, who today loses matches through lack of resource, become by virtue of experience and tournament play the greatest player on the continent.

"[5] In 1921, at his first appearance at the Wimbledon Championships, Alonso made his way through to the all-comers final (beating Algernon Kingscote and Zenzo Shimizu before losing to Brian Norton in five sets).

[6] He played at Wimbledon in 1922 and 1924 again, but couldn't repeat this success and dropped out of the competition in early rounds.

From 1921 to 1925, Alonso was a member of the Spanish Davis Cup team and reached the final in 1922 partnering Manuel de Gomar.