Alexander Livingston Nicol Jr. (January 20, 1916 – July 29, 2001) was an American actor and film director. Nicol appeared in many Westerns including The Man from Laramie (1955). He appeared in more than forty feature films as well as directing many television shows including The Wild Wild West (1967), Tarzan (1966), and Daniel Boone (1966). He also played many roles on Broadway.

Nicol was born in Ossining, New York, in 1916. When his movie career started thirty-four years later he adjusted the year to 1919. "I was a little older than some of the other people under contract so I thought, 'Well, I'll cure that right now'," he later confessed. His father was the arms keeper at Sing Sing. He studied at the Feagin School of Dramatic Art before joining Maurice Evans' theatrical company, with whom he made his Broadway debut with a walk-on in Henry IV, Part 1 (1939). Later a member of The Actors Studio, Nicol would play Brick in Tennessee Williams's Cat on a Hot Tin Roof, under the direction of Studio co-founder Elia Kazan.

However, it was as a character actor that Nicol spent most of his career. He also directed films, and appeared frequently on television. His acting career was interrupted by a five-year stint in the army. He served with the 101st Cavalry and attained the rank of Technical Sergeant.

Upon discharge, Nicol returned to Broadway in a revival of Clifford Odets' pro-union drama Waiting for Lefty (1946).^{[citation needed]} Shortly thereafter, he was admitted to The Actors Studio, where he worked with Elia Kazan; this led to a role in the Studio's 1948 production of Sundown Beach, staged by Kazan. Nicol next appeared in Forward the Heart, and then as part of the original cast of Rodgers and Hammerstein's musical South Pacific (1949), playing one of the marines, but after a few weeks in the show he successfully auditioned to replace Ralph Meeker as Mannion in Mister Roberts, and was also made understudy to the play's star Henry Fonda.

But I never made it! He never missed a performance! And Henry's wife at the time died during the run of Mr. Roberts, but he still didn't miss the performance the night she died. He didn't show up, and the stage manager finally said to me, 'Okay, Alex, get dressed'. So I had the outfit on, and then the stage manager looked at his watch and said, 'All right, two more minutes, and we go up'. And we were one minute away from curtain time, and Fonda walked in, in costume, and he just walked right out, hit his mark, and he played the performance as though nothing had happened.

While acting in Mister Roberts, Nicol was seen by the Universal Studios director George Sherman, who was in New York City to film The Sleeping City (1950). He cast Nicol as a young doctor. Nicol was given a contract by Universal, and Sherman also directed his second film, Tomahawk (1951), in which he played a cavalry officer with a hatred of Indians.

Small roles as a prisoner of war in Target Unknown (1951) and a trainee pilot in Air Cadet (1951) preceded Nicol's first major part, co-starring with Frank Sinatra and Shelley Winters in the musical drama Meet Danny Wilson (1952). In his next film he was an antagonist again, causing Loretta Young to be wrongly sent to prison in Because of You (1952). He played a troublesome sergeant in Red Ball Express (1952), directed by Budd Boetticher.

Nicol's first lead role was opposite Maureen O'Hara in The Redhead from Wyoming (1953) directed by Lee Sholem.