| Árni Njálsson | |
| Fullname: | Árni Njálsson |
| Birth Date: | 16 June 1936 |
| Birth Place: | Iceland |
| Position: | Defender |
| Years1: | 1956–1967 |
| Nationalyears1: | 1956–1967 |
| Nationalcaps1: | 23 |
| Nationalgoals1: | 0 |
Árni Njálsson (born 16 June 1936) is an Icelandic former footballer who played as a defender. He won 23 caps for the Iceland national football team between 1956 and 1967.