1986 World Junior Championships in Athletics – Men's decathlon

The men's decathlon event at the 1986 World Junior Championships in Athletics was held in Athens, Greece, at Olympic Stadium on 16 and 17 July. Senior implements (106.7 cm (3'6) hurdles, 7257g shot, 2 kg discus) were used.

Final
16/17 July {{legend|#F2F5A9|The highest mark recorded in each event is highlighted in yellow|border=solid 1px #AAAAAA}} N.B. In the 100 meters, of the 4 heats, two were run with legal wind & two heats were run with wind above the legal limit of 2 m/s.

Participation
According to an unofficial count, 29 athletes from 21 countries participated in the event. • 🇦🇺 australia (1)

• 🇦🇹 austria (1)

• 🇨🇦 canada (2)

• 🇨🇺 cuba (1)

• undefined (1)

• undefined (1)

• undefined (2)

• 🇪🇨 ecuador (1)

• 🇫🇮 finland (2)

• undefined (2)

• 🇭🇺 hungary (2)

• 🇮🇪 ireland (1)

• undefined (1)

• 🇳🇴 norway (1)

• undefined (1)

• undefined (2)

• 🇪🇸 spain (1)

• undefined (2)

• 🇺🇸 united states (1)

• 🇻🇪 venezuela (1)

• undefined (2)