Seshan may refer to:

• Srinivasan Seshan, American computer scientist
• N. K. Seshan, Indian politician
• T. N. Seshan, Former Chief Election Commissioner of India

• 80-20 Law
• 80-20 law
• 80/20 principle
• 80/20 Rule
• 80/20 Thinking
• 80/20 Thinking Limited
• 8021
• 802.11-1999
• 802.11aa
• 80211b
• 802.11b channels
• 802.11 b/g
• 802.11 channels
• 80211g
• 802.11g+
• 802.11g channels
• 802.11 n
• 80211n
• 802.11N
• 802.11s
• 802.16d
• 802.16j
• 802.16m
• 802.1aq
• 802.1ax